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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 32 |
| 4 | 318 |
| 5 | 3692 |
| 6 | 47536 |
| 7 | 657040 |
| 8 | 9563961 |
| 9 | 144847330 |
| 10 | 2263567060 |
| 11 | 36281911266 |
| 12 | 593856894136 |
| 13 | 9892591942306 |
| 14 | 167278802007062 |
| 15 | 2865331941321996 |
| 16 | 49634901816988932 |
| 17 | 868329574365547207 |
[1,4,32,318,3692,47536,657040,9563961,144847330, 2263567060,36281911266,593856894136,9892591942306, 167278802007062,2865331941321996, 49634901816988932,868329574365547207] |