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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 1923 |
| 3 | 59644 |
| 4 | 3699851 |
| 5 | 114755025 |
| 6 | 7118511401 |
| 7 | 220788608456 |
| 8 | 13696012235673 |
| 9 | 424797167914319 |
| 10 | 26351120422923451 |
| 11 | 817309530278541300 |
| 12 | 50699541997692484051 |
| 13 | 1572503111458745546881 |
| 14 | 97545892452439916390673 |
| 15 | 3025495169137096153657744 |
[1,31,1923,59644,3699851,114755025,7118511401, 220788608456,13696012235673,424797167914319, 26351120422923451,817309530278541300, 50699541997692484051,1572503111458745546881, 97545892452439916390673,3025495169137096153657744] |