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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 31 |
| 4 | 176 |
| 5 | 1071 |
| 6 | 6797 |
| 7 | 44493 |
| 8 | 298279 |
| 9 | 2037550 |
| 10 | 14131441 |
| 11 | 99244564 |
| 12 | 704360703 |
| 13 | 5043969503 |
| 14 | 36399930179 |
| 15 | 264451303466 |
| 16 | 1932650461883 |
| 17 | 14198082537190 |
| 18 | 104792195449688 |
| 19 | 776681663951998 |
| 20 | 5778226417888171 |
| 21 | 43135097969972931 |
| 22 | 323012620411650708 |
| 23 | 2425745980876575899 |
| 24 | 18264470545275495152 |
[1,1,6,31,176,1071,6797,44493,298279,2037550, 14131441,99244564,704360703,5043969503, 36399930179,264451303466,1932650461883, 14198082537190,104792195449688,776681663951998, 5778226417888171,43135097969972931, 323012620411650708,2425745980876575899, 18264470545275495152] |