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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 79 |
| 5 | 847 |
| 6 | 11436 |
| 7 | 185944 |
| 8 | 3533720 |
| 9 | 76826061 |
| 10 | 1880107840 |
| 11 | 51139278646 |
| 12 | 1530376944768 |
| 13 | 49965900317755 |
| 14 | 1767387701671424 |
| 15 | 67325805434672100 |
| 16 | 2747849045156064256 |
| 17 | 119626103584870552921 |
| 18 | 5533218319763109888000 |
| 19 | 270982462739224265922466 |
[1,1,2,10,79,847,11436,185944,3533720,76826061, 1880107840,51139278646,1530376944768, 49965900317755,1767387701671424,67325805434672100, 2747849045156064256,119626103584870552921, 5533218319763109888000,270982462739224265922466] |