| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 5 |
| 6 | 16 |
| 7 | 30 |
| 8 | 63 |
| 9 | 108 |
| 10 | 189 |
| 11 | 298 |
| 12 | 483 |
| 13 | 720 |
| 14 | 1092 |
| 15 | 1582 |
| 16 | 2297 |
| 17 | 3225 |
| 18 | 4551 |
| 19 | 6244 |
| 20 | 8592 |
| 21 | 11590 |
| 22 | 15622 |
| 23 | 20741 |
| 24 | 27536 |
| 25 | 36066 |
| 26 | 47198 |
| 27 | 61150 |
| 28 | 79077 |
| 29 | 101391 |
| 30 | 129808 |
| 31 | 164934 |
| 32 | 209213 |
| 33 | 263745 |
| 34 | 331807 |
| 35 | 415229 |
| 36 | 518656 |
| 37 | 644719 |
| 38 | 799926 |
| 39 | 988432 |
| 40 | 1218979 |
[0,0,0,2,5,16,30,63,108,189,298,483,720,1092,1582, 2297,3225,4551,6244,8592,11590,15622,20741,27536, 36066,47198,61150,79077,101391,129808,164934, 209213,263745,331807,415229,518656,644719,799926, 988432,1218979] |