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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 312 |
| 3 | 47712 |
| 4 | 2836520 |
| 5 | 173139952 |
| 6 | 9816981756 |
| 7 | 536229705204 |
| 8 | 28589370541536 |
| 9 | 1495349029171972 |
| 10 | 77085183211404184 |
| 11 | 3927954723497651964 |
| 12 | 198272030861373733756 |
| 13 | 9930061632056145835716 |
| 14 | 494048861047645225914508 |
[0,312,47712,2836520,173139952,9816981756, 536229705204,28589370541536,1495349029171972, 77085183211404184,3927954723497651964, 198272030861373733756,9930061632056145835716, 494048861047645225914508] |