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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 21 |
| 4 | 310 |
| 5 | 762 |
| 6 | 12820 |
| 7 | 33805 |
| 8 | 607550 |
| 9 | 1667214 |
| 10 | 31182540 |
| 11 | 87799362 |
| 12 | 1686609820 |
| 13 | 4835044372 |
| 14 | 94676506920 |
| 15 | 275037241149 |
| 16 | 5463738069390 |
| 17 | 16035014605830 |
| 18 | 322140216214300 |
| 19 | 953095126595062 |
| 20 | 19320606147948820 |
| 21 | 57539265876939756 |
| 22 | 1175037853461723160 |
| 23 | 3518503980453113106 |
[1,1,10,21,310,762,12820,33805,607550,1667214, 31182540,87799362,1686609820,4835044372, 94676506920,275037241149,5463738069390, 16035014605830,322140216214300,953095126595062, 19320606147948820,57539265876939756, 1175037853461723160,3518503980453113106] |