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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 29 |
| 3 | 111 |
| 4 | 468 |
| 5 | 1985 |
| 6 | 8126 |
| 7 | 33933 |
| 8 | 141664 |
| 9 | 588156 |
| 10 | 2449547 |
| 11 | 10201129 |
| 12 | 42445694 |
| 13 | 176698722 |
| 14 | 735575546 |
| 15 | 3061694857 |
| 16 | 12744724374 |
| 17 | 53051527226 |
| 18 | 220828964794 |
| 19 | 919220181758 |
| 20 | 3826333903711 |
| 21 | 15927393968521 |
| 22 | 66299068852883 |
[7,29,111,468,1985,8126,33933,141664,588156, 2449547,10201129,42445694,176698722,735575546, 3061694857,12744724374,53051527226,220828964794, 919220181758,3826333903711,15927393968521, 66299068852883] |