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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 36 |
| 5 | 285 |
| 6 | 2470 |
| 7 | 25891 |
| 8 | 304584 |
| 9 | 4116473 |
| 10 | 61307338 |
| 11 | 1011045759 |
| 12 | 18130445036 |
| 13 | 353222430613 |
| 14 | 7401849057902 |
| 15 | 166375042595867 |
| 16 | 3987022624401808 |
| 17 | 101564702642995953 |
| 18 | 2738893925584229778 |
| 19 | 77978462505905882103 |
| 20 | 2336771614133464558516 |
| 21 | 73533230212519134743821 |
[0,1,2,7,36,285,2470,25891,304584,4116473, 61307338,1011045759,18130445036,353222430613, 7401849057902,166375042595867,3987022624401808, 101564702642995953,2738893925584229778, 77978462505905882103,2336771614133464558516, 73533230212519134743821] |