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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 10 |
| 7 | 20 |
| 8 | 41 |
| 9 | 77 |
| 10 | 126 |
| 11 | 252 |
| 12 | 392 |
| 13 | 844 |
| 14 | 1270 |
| 15 | 2800 |
| 16 | 4070 |
| 17 | 9020 |
| 18 | 12782 |
| 19 | 28679 |
| 20 | 40022 |
| 21 | 91286 |
| 22 | 126048 |
| 23 | 291018 |
| 24 | 398125 |
| 25 | 926177 |
| 26 | 1256717 |
| 27 | 2942192 |
| 28 | 3965620 |
| 29 | 9343948 |
| 30 | 12526280 |
| 31 | 29689088 |
| 32 | 39617627 |
| 33 | 94363367 |
[0,0,0,0,0,10,20,41,77,126,252,392,844,1270,2800, 4070,9020,12782,28679,40022,91286,126048,291018, 398125,926177,1256717,2942192,3965620,9343948, 12526280,29689088,39617627,94363367] |