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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 22 |
| 4 | 164 |
| 5 | 1837 |
| 6 | 34176 |
| 7 | 1106012 |
| 8 | 63053480 |
| 9 | 6385424679 |
| 10 | 1160549661044 |
| 11 | 382452061644152 |
| 12 | 230599430810507856 |
| 13 | 256385360437413619926 |
| 14 | 529174935800200166078372 |
| 15 | 2039277788771681728279205788 |
[1,1,4,22,164,1837,34176,1106012,63053480, 6385424679,1160549661044,382452061644152, 230599430810507856,256385360437413619926, 529174935800200166078372, 2039277788771681728279205788] |