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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 164 |
| 4 | 3127 |
| 5 | 82600 |
| 6 | 2845775 |
| 7 | 122820136 |
| 8 | 6446913953 |
| 9 | 402413160952 |
| 10 | 29343933156485 |
| 11 | 2464029760993520 |
| 12 | 235446319553848087 |
| 13 | 25346231173047308256 |
| 14 | 3047931031445529965527 |
| 15 | 406412844141860523543392 |
| 16 | 59704680455100785101683457 |
| 17 | 9608818815170839730520275488 |
[1,2,13,164,3127,82600,2845775,122820136, 6446913953,402413160952,29343933156485, 2464029760993520,235446319553848087, 25346231173047308256,3047931031445529965527, 406412844141860523543392, 59704680455100785101683457, 9608818815170839730520275488] |