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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 59 |
| 4 | 940 |
| 5 | 31637 |
| 6 | 2005106 |
| 7 | 166100111 |
| 8 | 16050083800 |
| 9 | 1874971666857 |
| 10 | 279670143989598 |
| 11 | 53041020901061987 |
| 12 | 12139626880904714372 |
| 13 | 3219275040968635076157 |
| 14 | 979189869389394861709514 |
| 15 | 342690421890075448877502135 |
| 16 | 137691551060667051544057815472 |
[0,1,6,59,940,31637,2005106,166100111,16050083800, 1874971666857,279670143989598,53041020901061987, 12139626880904714372,3219275040968635076157, 979189869389394861709514, 342690421890075448877502135, 137691551060667051544057815472] |