The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A123308 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A123308

Column 2 of triangle A123305.
(history; published version)

#5 by Charles R Greathouse IV at Thu Jun 11 14:06:59 EDT 2015

STATUS

editing

approved

#4 by Charles R Greathouse IV at Thu Jun 11 14:06:56 EDT 2015

CROSSREFS

Cf. A123305; , A123306, A123307, A123309; , A123310, A123311.

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:36:59 EDT 2012

AUTHOR

_Paul D. Hanna (pauldhanna(AT)juno.com), _, Sep 24 2006

Discussion

Fri Mar 30

18:36

OEIS Server: https://oeis.org/edit/global/213

#2 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007

KEYWORD

nonn,new

nonn

AUTHOR

Paul D . Hanna (pauldhanna(AT)juno.com), Sep 24 2006

#1 by N. J. A. Sloane at Fri Sep 29 03:00:00 EDT 2006

NAME

Column 2 of triangle A123305.

DATA

1, 3, 18, 144, 1422, 16848, 235458, 3827628, 71466174, 1515031920, 36091609434, 957367079244, 28050237910926, 901359663633000, 31567805908329330, 1198307340146774844, 49060139971072916142, 2156816501291429473248

OFFSET

0,2

COMMENTS

Triangle T=A123305 is defined by: (column k of T) = (k+1)*(column k of T^2) shifted to have an initial '1'; thus this sequence shifted left equals 3 times column 2 of T^2 (matrix square of A123305).

CROSSREFS

Cf. A123305; A123306, A123307, A123309; A123310, A123311.

KEYWORD

nonn,new

AUTHOR

Paul D Hanna (pauldhanna(AT)juno.com), Sep 24 2006

STATUS

approved