| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 105 |
| 3 | 378 |
| 4 | 780 |
| 5 | 2145 |
| 6 | 1485 |
| 7 | 5460 |
| 8 | 7875 |
| 9 | 29403 |
| 10 | 21945 |
| 11 | 70125 |
| 12 | 105570 |
| 13 | 61425 |
| 14 | 37950 |
| 15 | 255255 |
| 16 | 306153 |
| 17 | 61425 |
| 18 | 667590 |
| 19 | 749700 |
| 20 | 522753 |
| 21 | 1016025 |
| 22 | 353220 |
| 23 | 176715 |
| 24 | 1471470 |
| 25 | 1445850 |
| 26 | 1747515 |
| 27 | 246753 |
| 28 | 794430 |
| 29 | 749700 |
| 30 | 514605 |
| 31 | 3499335 |
| 32 | 2953665 |
| 33 | 5073705 |
| 34 | 635628 |
| 35 | 8382465 |
[15,105,378,780,2145,1485,5460,7875,29403,21945, 70125,105570,61425,37950,255255,306153,61425, 667590,749700,522753,1016025,353220,176715, 1471470,1445850,1747515,246753,794430,749700, 514605,3499335,2953665,5073705,635628,8382465] |