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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 18 |
| 6 | 116 |
| 7 | 1060 |
| 8 | 13019 |
| 9 | 193425 |
| 10 | 3313522 |
| 11 | 63667788 |
| 12 | 1351700744 |
| 13 | 31390695708 |
| 14 | 791372281393 |
| 15 | 21523271532811 |
| 16 | 628166776833181 |
| 17 | 19582955637428422 |
| 18 | 649472761243051940 |
| 19 | 22833268501579122332 |
| 20 | 848230375982060558217 |
[0,1,1,4,18,116,1060,13019,193425,3313522, 63667788,1351700744,31390695708,791372281393, 21523271532811,628166776833181,19582955637428422, 649472761243051940,22833268501579122332, 848230375982060558217] |