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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 6 |
| 9 | 26 |
| 10 | 88 |
| 11 | 267 |
| 12 | 743 |
| 13 | 1968 |
| 14 | 5006 |
| 15 | 12394 |
| 16 | 29984 |
| 17 | 71289 |
| 18 | 166927 |
| 19 | 386042 |
| 20 | 882887 |
| 21 | 1999964 |
| 22 | 4491226 |
| 23 | 10008151 |
| 24 | 22144282 |
| 25 | 48681992 |
| 26 | 106384313 |
| 27 | 231200051 |
| 28 | 499868227 |
| 29 | 1075542674 |
| 30 | 2303703530 |
| 31 | 4913213715 |
| 32 | 10436198873 |
[0,0,0,0,0,0,0,1,6,26,88,267,743,1968,5006,12394, 29984,71289,166927,386042,882887,1999964,4491226, 10008151,22144282,48681992,106384313,231200051, 499868227,1075542674,2303703530,4913213715, 10436198873] |