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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 15 |
| 5 | 30 |
| 6 | 53 |
| 7 | 84 |
| 8 | 126 |
| 9 | 180 |
| 10 | 248 |
| 11 | 330 |
| 12 | 429 |
| 13 | 546 |
| 14 | 683 |
| 15 | 840 |
| 16 | 1020 |
| 17 | 1224 |
| 18 | 1454 |
| 19 | 1710 |
| 20 | 1995 |
| 21 | 2310 |
| 22 | 2657 |
| 23 | 3036 |
| 24 | 3450 |
| 25 | 3900 |
| 26 | 4388 |
| 27 | 4914 |
| 28 | 5481 |
| 29 | 6090 |
| 30 | 6743 |
| 31 | 7440 |
| 32 | 8184 |
| 33 | 8976 |
| 34 | 9818 |
| 35 | 10710 |
| 36 | 11655 |
| 37 | 12654 |
| 38 | 13709 |
| 39 | 14820 |
| 40 | 15990 |
| 41 | 17220 |
| 42 | 18512 |
| 43 | 19866 |
| 44 | 21285 |
| 45 | 22770 |
[0,0,2,6,15,30,53,84,126,180,248,330,429,546,683, 840,1020,1224,1454,1710,1995,2310,2657,3036,3450, 3900,4388,4914,5481,6090,6743,7440,8184,8976,9818, 10710,11655,12654,13709,14820,15990,17220,18512, 19866,21285,22770] |