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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 39 |
| 5 | 171 |
| 6 | 719 |
| 7 | 2757 |
| 8 | 9751 |
| 9 | 31312 |
| 10 | 89927 |
| 11 | 229614 |
| 12 | 517854 |
| 13 | 1022224 |
| 14 | 1753737 |
| 15 | 2598215 |
| 16 | 3312423 |
| 17 | 3626632 |
| 18 | 3413313 |
| 19 | 2765623 |
| 20 | 1930324 |
| 21 | 1160977 |
| 22 | 600372 |
| 23 | 265865 |
| 24 | 100565 |
| 25 | 32250 |
| 26 | 8688 |
| 27 | 1917 |
| 28 | 348 |
| 29 | 50 |
| 30 | 7 |
| 31 | 2 |
| 32 | 0 |
[1,1,2,8,39,171,719,2757,9751,31312,89927,229614, 517854,1022224,1753737,2598215,3312423,3626632, 3413313,2765623,1930324,1160977,600372,265865, 100565,32250,8688,1917,348,50,7,2,0] |