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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 12 |
| 5 | 44 |
| 6 | 236 |
| 7 | 2028 |
| 8 | 29164 |
| 9 | 719340 |
| 10 | 30943724 |
| 11 | 2350770668 |
| 12 | 318680099308 |
| 13 | 77793540073964 |
| 14 | 34472347123476972 |
| 15 | 27928291976711924204 |
| 16 | 41631598900551078537708 |
| 17 | 114829789064202679162399212 |
[1,4,12,44,236,2028,29164,719340,30943724, 2350770668,318680099308,77793540073964, 34472347123476972,27928291976711924204, 41631598900551078537708, 114829789064202679162399212] |