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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 819 |
| 5 | 14850 |
| 6 | 87318 |
| 7 | 327060 |
| 8 | 947025 |
| 9 | 2314494 |
| 10 | 5011020 |
| 11 | 9902088 |
| 12 | 18216495 |
| 13 | 31635450 |
| 14 | 52391394 |
| 15 | 83376540 |
| 16 | 128261133 |
| 17 | 191621430 |
| 18 | 279077400 |
| 19 | 397440144 |
| 20 | 554869035 |
| 21 | 761038578 |
| 22 | 1027314990 |
| 23 | 1366942500 |
| 24 | 1795239369 |
| 25 | 2329803630 |
[0,0,819,14850,87318,327060,947025,2314494, 5011020,9902088,18216495,31635450,52391394, 83376540,128261133,191621430,279077400,397440144, 554869035,761038578,1027314990,1366942500, 1795239369,2329803630] |