| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 24 |
| 4 | 236 |
| 5 | 1148 |
| 6 | 3932 |
| 7 | 10760 |
| 8 | 25392 |
| 9 | 53576 |
| 10 | 103824 |
| 11 | 188104 |
| 12 | 322852 |
| 13 | 529116 |
| 14 | 835028 |
| 15 | 1275360 |
| 16 | 1893496 |
| 17 | 2742208 |
| 18 | 3886568 |
| 19 | 5402448 |
| 20 | 7381316 |
| 21 | 9928860 |
| 22 | 13168484 |
| 23 | 17243896 |
| 24 | 22319864 |
| 25 | 28579720 |
| 26 | 36237928 |
| 27 | 45532720 |
| 28 | 56732668 |
[0,0,24,236,1148,3932,10760,25392,53576,103824, 188104,322852,529116,835028,1275360,1893496, 2742208,3886568,5402448,7381316,9928860,13168484, 17243896,22319864,28579720,36237928,45532720, 56732668] |