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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 76 |
| 3 | 3424 |
| 4 | 277456 |
| 5 | 35345344 |
| 6 | 6504742336 |
| 7 | 1632531979264 |
| 8 | 535821754153216 |
| 9 | 222769351470429184 |
| 10 | 114411762387714436096 |
| 11 | 71132353206363509039104 |
| 12 | 52648938670226334981246976 |
[1,4,76,3424,277456,35345344,6504742336, 1632531979264,535821754153216,222769351470429184, 114411762387714436096,71132353206363509039104, 52648938670226334981246976] |