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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2384 |
| 4 | 183472 |
| 5 | 1110000 |
| 6 | 3193800 |
| 7 | 6481216 |
| 8 | 10899404 |
| 9 | 16418600 |
| 10 | 23038804 |
| 11 | 30760016 |
| 12 | 39582236 |
| 13 | 49505464 |
| 14 | 60529700 |
| 15 | 72654944 |
| 16 | 85881196 |
| 17 | 100208456 |
| 18 | 115636724 |
| 19 | 132166000 |
| 20 | 149796284 |
| 21 | 168527576 |
| 22 | 188359876 |
| 23 | 209293184 |
| 24 | 231327500 |
| 25 | 254462824 |
| 26 | 278699156 |
[0,0,2384,183472,1110000,3193800,6481216,10899404, 16418600,23038804,30760016,39582236,49505464, 60529700,72654944,85881196,100208456,115636724, 132166000,149796284,168527576,188359876,209293184, 231327500,254462824,278699156] |