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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 39 |
| 4 | 385 |
| 5 | 917 |
| 6 | 31247 |
| 7 | 22527 |
| 8 | 1081986 |
| 9 | 2464860 |
| 10 | 50099635 |
| 11 | 14931071 |
| 12 | 19684696065 |
| 13 | 394805109 |
| 14 | 82267017929 |
| 15 | 496514888157 |
| 16 | 11386442827781 |
| 17 | 284625019799 |
| 18 | 3469798073972537 |
| 19 | 7725084195239 |
| 20 | 136470024990370842 |
| 21 | 28400489198168457 |
| 22 | 241211623942678951 |
| 23 | 5776331152550399 |
[1,1,8,39,385,917,31247,22527,1081986,2464860, 50099635,14931071,19684696065,394805109, 82267017929,496514888157,11386442827781, 284625019799,3469798073972537,7725084195239, 136470024990370842,28400489198168457, 241211623942678951,5776331152550399] |