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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 41 |
| 3 | 311 |
| 4 | 1655 |
| 5 | 4905 |
| 6 | 15705 |
| 7 | 32855 |
| 8 | 76375 |
| 9 | 142714 |
| 10 | 272714 |
| 11 | 435096 |
| 12 | 797976 |
| 13 | 1171466 |
| 14 | 1857466 |
| 15 | 2734966 |
| 16 | 4131702 |
| 17 | 5556472 |
| 18 | 8210032 |
| 19 | 10692990 |
| 20 | 15060990 |
| 21 | 19691490 |
| 22 | 26186770 |
| 23 | 32635280 |
| 24 | 44385680 |
| 25 | 54557555 |
| 26 | 69497155 |
| 27 | 85637215 |
| 28 | 108686815 |
| 29 | 129222353 |
| 30 | 164322353 |
[1,41,311,1655,4905,15705,32855,76375,142714, 272714,435096,797976,1171466,1857466,2734966, 4131702,5556472,8210032,10692990,15060990, 19691490,26186770,32635280,44385680,54557555, 69497155,85637215,108686815,129222353,164322353] |