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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 25 |
| 3 | 31 |
| 4 | 56 |
| 5 | 87 |
| 6 | 230 |
| 7 | 1237 |
| 8 | 3941 |
| 9 | 9119 |
| 10 | 113369 |
| 11 | 3523558 |
| 12 | 42396065 |
| 13 | 88315688 |
| 14 | 307343129 |
| 15 | 1625031333 |
| 16 | 3557405795 |
| 17 | 5182437128 |
| 18 | 8739842923 |
| 19 | 13922280051 |
| 20 | 64428963127 |
| 21 | 400496058813 |
| 22 | 24895184609533 |
| 23 | 149771603716011 |
| 24 | 623981599473577 |
| 25 | 773753203189588 |
[1,6,25,31,56,87,230,1237,3941,9119,113369, 3523558,42396065,88315688,307343129,1625031333, 3557405795,5182437128,8739842923,13922280051, 64428963127,400496058813,24895184609533, 149771603716011,623981599473577,773753203189588] |