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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 21 |
| 3 | 1886 |
| 4 | 381735 |
| 5 | 134584434 |
| 6 | 72514796422 |
| 7 | 55192152857400 |
| 8 | 56287911330435339 |
| 9 | 74043167807482274450 |
| 10 | 122040226074154110294114 |
| 11 | 246341047594913378800486668 |
| 12 | 597752265070243363135031803950 |
| 13 | 1716967839431601765698468898047292 |
| 14 | 5762431350664488199395983555754160140 |
| 15 | 22346478647255335081326815815314403748524 |
[1,1,21,1886,381735,134584434,72514796422, 55192152857400,56287911330435339, 74043167807482274450,122040226074154110294114, 246341047594913378800486668, 597752265070243363135031803950, 1716967839431601765698468898047292, 5762431350664488199395983555754160140, 22346478647255335081326815815314403748524] |