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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 37 |
| 3 | 559 |
| 4 | 11776 |
| 5 | 318511 |
| 6 | 10522639 |
| 7 | 410701432 |
| 8 | 18492087079 |
| 9 | 943507142461 |
| 10 | 53798399207356 |
| 11 | 3390242657205889 |
| 12 | 233980541746413697 |
| 13 | 17551930873638233164 |
| 14 | 1421940381306443299981 |
| 15 | 123726365104534205331511 |
| 16 | 11507973895102987539130504 |
[1,4,37,559,11776,318511,10522639,410701432, 18492087079,943507142461,53798399207356, 3390242657205889,233980541746413697, 17551930873638233164,1421940381306443299981, 123726365104534205331511, 11507973895102987539130504] |