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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 56 |
| 5 | 424 |
| 6 | 2979 |
| 7 | 43547 |
| 8 | 596720 |
| 9 | 16903736 |
| 10 | 450129276 |
| 11 | 24740929636 |
| 12 | 1274646618498 |
| 13 | 135794808093563 |
| 14 | 13566737103811527 |
| 15 | 2802238029568573488 |
| 16 | 542899687293133798346 |
| 17 | 217420519981066905114215 |
[1,2,4,16,56,424,2979,43547,596720,16903736, 450129276,24740929636,1274646618498, 135794808093563,13566737103811527, 2802238029568573488,542899687293133798346, 217420519981066905114215] |