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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 22 |
| 3 | 631 |
| 4 | 20546 |
| 5 | 721071 |
| 6 | 26594464 |
| 7 | 1016157668 |
| 8 | 39868799482 |
| 9 | 1596785816431 |
| 10 | 65014851904262 |
| 11 | 2683064838415039 |
| 12 | 111976833827421368 |
| 13 | 4717961282984709124 |
| 14 | 200410768873037098384 |
| 15 | 8573481927644738115096 |
| 16 | 369045717586929668129706 |
| 17 | 15972561730958196240953007 |
[1,1,22,631,20546,721071,26594464,1016157668, 39868799482,1596785816431,65014851904262, 2683064838415039,111976833827421368, 4717961282984709124,200410768873037098384, 8573481927644738115096,369045717586929668129706, 15972561730958196240953007] |