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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 9 |
| 8 | 16 |
| 9 | 38 |
| 10 | 62 |
| 11 | 147 |
| 12 | 241 |
| 13 | 564 |
| 14 | 926 |
| 15 | 2148 |
| 16 | 3561 |
| 17 | 8195 |
| 18 | 13700 |
| 19 | 31349 |
| 20 | 52858 |
| 21 | 120357 |
| 22 | 204444 |
| 23 | 463712 |
| 24 | 792986 |
| 25 | 1792582 |
| 26 | 3083469 |
| 27 | 6950579 |
| 28 | 12018394 |
| 29 | 27023509 |
| 30 | 46943409 |
| 31 | 105320716 |
| 32 | 183715445 |
| 33 | 411364068 |
| 34 | 720236762 |
| 35 | 1609836928 |
| 36 | 2828102115 |
[0,0,0,1,2,4,9,16,38,62,147,241,564,926,2148,3561, 8195,13700,31349,52858,120357,204444,463712, 792986,1792582,3083469,6950579,12018394,27023509, 46943409,105320716,183715445,411364068,720236762, 1609836928,2828102115] |