| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 15 |
| 7 | 35 |
| 8 | 70 |
| 9 | 123 |
| 10 | 195 |
| 11 | 285 |
| 12 | 420 |
| 13 | 586 |
| 14 | 818 |
| 15 | 1110 |
| 16 | 1451 |
| 17 | 1846 |
| 18 | 2361 |
| 19 | 2956 |
| 20 | 3704 |
| 21 | 4567 |
| 22 | 5530 |
| 23 | 6631 |
| 24 | 7963 |
| 25 | 9443 |
| 26 | 11113 |
| 27 | 13005 |
| 28 | 15111 |
| 29 | 17450 |
| 30 | 20167 |
| 31 | 23064 |
| 32 | 26396 |
| 33 | 30053 |
| 34 | 34046 |
| 35 | 38447 |
| 36 | 43230 |
| 37 | 48245 |
| 38 | 53890 |
| 39 | 60061 |
| 40 | 66703 |
| 41 | 73713 |
| 42 | 81503 |
| 43 | 89746 |
[0,0,0,1,5,15,35,70,123,195,285,420,586,818,1110, 1451,1846,2361,2956,3704,4567,5530,6631,7963,9443, 11113,13005,15111,17450,20167,23064,26396,30053, 34046,38447,43230,48245,53890,60061,66703,73713, 81503,89746] |