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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 344 |
| 4 | 13528 |
| 5 | 833432 |
| 6 | 73871416 |
| 7 | 8893109864 |
| 8 | 1394602938808 |
| 9 | 275985896665592 |
| 10 | 67227147723919096 |
| 11 | 19756312865302785224 |
| 12 | 6889612105281125091448 |
| 13 | 2811911251972519547757272 |
| 14 | 1327454489179890318710048056 |
| 15 | 717555570945004782603934710824 |
[1,2,16,344,13528,833432,73871416,8893109864, 1394602938808,275985896665592,67227147723919096, 19756312865302785224,6889612105281125091448, 2811911251972519547757272, 1327454489179890318710048056, 717555570945004782603934710824] |