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| n | a(n) |
|---|---|
| 1 | 76 |
| 2 | 544 |
| 3 | 3360 |
| 4 | 21968 |
| 5 | 140816 |
| 6 | 909520 |
| 7 | 5858896 |
| 8 | 37779664 |
| 9 | 243525712 |
| 10 | 1569965008 |
| 11 | 10120785744 |
| 12 | 65244856016 |
| 13 | 420606054992 |
| 14 | 2711476238800 |
| 15 | 17479769838928 |
| 16 | 112684908266704 |
| 17 | 726433311008848 |
| 18 | 4683017326649296 |
| 19 | 30189489673849680 |
[76,544,3360,21968,140816,909520,5858896,37779664, 243525712,1569965008,10120785744,65244856016, 420606054992,2711476238800,17479769838928, 112684908266704,726433311008848,4683017326649296, 30189489673849680] |