A339576 - OEIS

A339576

Row sums of triangle A236104.

1, 4, 10, 17, 29, 41, 59, 74, 101, 121, 151, 179, 215, 245, 295, 326, 374, 423, 477, 519, 591, 641, 707, 767, 844, 904, 1000, 1056, 1140, 1234, 1324, 1387, 1507, 1587, 1701, 1794, 1902, 1992, 2136, 2226, 2346, 2476, 2602, 2692, 2874, 2984, 3122, 3246, 3397

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OFFSET

1,2

COMMENTS

In other words, a(n) is the sum of squares of terms in row n of A235791.

LINKS

Table of n, a(n) for n=1..49.

MAPLE

a:= n-> add(ceil((n+1)/k-(k+1)/2)^2, k=1..floor((sqrt(8*n+1)-1)/2)):

seq(a(n), n=1..60); # Alois P. Heinz, Dec 18 2020

PROG

(PARI) a(n) = sum(k=1, floor((sqrt(8*n+1)-1)/2), ceil((n+1)/k-(k+1)/2)^2) \\ Felix Fröhlich, Dec 19 2020; adapted from Maple code