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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 63 |
| 5 | 542 |
| 6 | 5183 |
| 7 | 62211 |
| 8 | 830252 |
| 9 | 12900381 |
| 10 | 220566835 |
| 11 | 4223662522 |
| 12 | 88001471869 |
| 13 | 2007052809465 |
| 14 | 49309469989666 |
| 15 | 1306455781607975 |
| 16 | 36973887007453315 |
| 17 | 1116728635342926570 |
| 18 | 35775769695237122035 |
| 19 | 1213704083311914974899 |
[1,1,2,11,63,542,5183,62211,830252,12900381, 220566835,4223662522,88001471869,2007052809465, 49309469989666,1306455781607975,36973887007453315, 1116728635342926570,35775769695237122035, 1213704083311914974899] |