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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 78 |
| 6 | 787 |
| 7 | 9640 |
| 8 | 138098 |
| 9 | 2257718 |
| 10 | 41409511 |
| 11 | 841370530 |
| 12 | 18753127340 |
| 13 | 454916534472 |
| 14 | 11932152340884 |
| 15 | 336529124983248 |
| 16 | 10156870523418506 |
| 17 | 326668220673870022 |
| 18 | 11154514687950236767 |
| 19 | 403044704522955726502 |
| 20 | 15364691402538733828594 |
| 21 | 616307960867208404852222 |
| 22 | 25948893032918425391596907 |
[1,1,1,2,10,78,787,9640,138098,2257718,41409511, 841370530,18753127340,454916534472,11932152340884, 336529124983248,10156870523418506, 326668220673870022,11154514687950236767, 403044704522955726502,15364691402538733828594, 616307960867208404852222, 25948893032918425391596907] |