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A138910 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 20 |
| 4 | 129 |
| 5 | 1164 |
| 6 | 12265 |
| 7 | 151458 |
| 8 | 2136337 |
| 9 | 33901640 |
| 10 | 597761361 |
| 11 | 11593851510 |
| 12 | 245310524041 |
| 13 | 5622982528188 |
| 14 | 138803996674057 |
| 15 | 3671135646515834 |
| 16 | 103568483199034785 |
| 17 | 3104443346427521808 |
| 18 | 98528857134710517793 |
[1,1,3,20,129,1164,12265,151458,2136337,33901640, 597761361,11593851510,245310524041,5622982528188, 138803996674057,3671135646515834, 103568483199034785,3104443346427521808, 98528857134710517793] |