| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 36 |
| 13 | 45 |
| 14 | 55 |
| 15 | 220 |
| 16 | 264 |
| 17 | 312 |
| 18 | 780 |
| 19 | 910 |
| 20 | 1050 |
| 21 | 3465 |
| 22 | 4220 |
| 23 | 5100 |
| 24 | 21420 |
| 25 | 26775 |
| 26 | 33117 |
| 27 | 118104 |
| 28 | 146300 |
| 29 | 179340 |
| 30 | 574644 |
| 31 | 708477 |
| 32 | 866019 |
| 33 | 2899380 |
| 34 | 3610540 |
| 35 | 4463500 |
| 36 | 15634300 |
| 37 | 19623175 |
| 38 | 24446565 |
| 39 | 83635695 |
[0,0,0,0,0,0,0,0,0,0,0,36,45,55,220,264,312,780, 910,1050,3465,4220,5100,21420,26775,33117,118104, 146300,179340,574644,708477,866019,2899380, 3610540,4463500,15634300,19623175,24446565, 83635695] |