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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 6 |
| 6 | 20 |
| 7 | 50 |
| 8 | 110 |
| 9 | 197 |
| 10 | 343 |
| 11 | 535 |
| 12 | 814 |
| 13 | 1171 |
| 14 | 1651 |
| 15 | 2240 |
| 16 | 2996 |
| 17 | 3900 |
| 18 | 5019 |
| 19 | 6333 |
| 20 | 7918 |
| 21 | 9744 |
| 22 | 11905 |
| 23 | 14366 |
| 24 | 17225 |
| 25 | 20451 |
| 26 | 24146 |
| 27 | 28274 |
| 28 | 32955 |
| 29 | 38143 |
| 30 | 43967 |
| 31 | 50380 |
| 32 | 57520 |
| 33 | 65335 |
| 34 | 73976 |
| 35 | 83386 |
| 36 | 93720 |
| 37 | 104925 |
| 38 | 117165 |
| 39 | 130377 |
| 40 | 144743 |
| 41 | 160190 |
| 42 | 176909 |
| 43 | 194831 |
[0,0,0,1,6,20,50,110,197,343,535,814,1171,1651, 2240,2996,3900,5019,6333,7918,9744,11905,14366, 17225,20451,24146,28274,32955,38143,43967,50380, 57520,65335,73976,83386,93720,104925,117165, 130377,144743,160190,176909,194831] |