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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 10 |
| 5 | 66 |
| 6 | 336 |
| 7 | 1527 |
| 8 | 6513 |
| 9 | 26667 |
| 10 | 106102 |
| 11 | 413265 |
| 12 | 1583331 |
| 13 | 5986689 |
| 14 | 22392606 |
| 15 | 83002842 |
| 16 | 305308666 |
| 17 | 1115587020 |
| 18 | 4052786850 |
| 19 | 14648359515 |
| 20 | 52705460583 |
| 21 | 188868467853 |
| 22 | 674332868566 |
| 23 | 2399653030899 |
| 24 | 8513523719661 |
[0,0,0,0,10,66,336,1527,6513,26667,106102,413265, 1583331,5986689,22392606,83002842,305308666, 1115587020,4052786850,14648359515,52705460583, 188868467853,674332868566,2399653030899, 8513523719661] |