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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 32 |
| 4 | 234 |
| 5 | 1854 |
| 6 | 15490 |
| 7 | 134380 |
| 8 | 1198944 |
| 9 | 10931761 |
| 10 | 101412677 |
| 11 | 954155059 |
| 12 | 9083120975 |
| 13 | 87326765375 |
| 14 | 846709605539 |
| 15 | 8269910074087 |
| 16 | 81291388929027 |
| 17 | 803592049667495 |
| 18 | 7983612883739843 |
| 19 | 79671910265120574 |
| 20 | 798283229227457304 |
| 21 | 8027625597750959053 |
[1,1,5,32,234,1854,15490,134380,1198944,10931761, 101412677,954155059,9083120975,87326765375, 846709605539,8269910074087,81291388929027, 803592049667495,7983612883739843, 79671910265120574,798283229227457304, 8027625597750959053] |