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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 29 |
| 5 | 104 |
| 6 | 416 |
| 7 | 1837 |
| 8 | 8853 |
| 9 | 46113 |
| 10 | 257583 |
| 11 | 1533308 |
| 12 | 9676148 |
| 13 | 64452909 |
| 14 | 451475027 |
| 15 | 3314964857 |
| 16 | 25442301577 |
| 17 | 203604718076 |
| 18 | 1695172374548 |
| 19 | 14654631691569 |
| 20 | 131309475792709 |
| 21 | 1217516798735521 |
| 22 | 11664652754184043 |
| 23 | 115319114738472472 |
| 24 | 1174967255260496776 |
[0,1,3,9,29,104,416,1837,8853,46113,257583, 1533308,9676148,64452909,451475027,3314964857, 25442301577,203604718076,1695172374548, 14654631691569,131309475792709,1217516798735521, 11664652754184043,115319114738472472, 1174967255260496776] |