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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 209 |
| 5 | 1476 |
| 6 | 10739 |
| 7 | 79780 |
| 8 | 601905 |
| 9 | 4595485 |
| 10 | 35419710 |
| 11 | 275109858 |
| 12 | 2150537435 |
| 13 | 16901814190 |
| 14 | 133452123796 |
| 15 | 1057920031536 |
[1,5,31,209,1476,10739,79780,601905,4595485, 35419710,275109858,2150537435,16901814190, 133452123796,1057920031536] |