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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 37 |
| 4 | 505 |
| 5 | 9076 |
| 6 | 202519 |
| 7 | 5397337 |
| 8 | 167237410 |
| 9 | 5906437651 |
| 10 | 234185226409 |
| 11 | 10299442379062 |
| 12 | 497567448860365 |
| 13 | 26191947311138701 |
| 14 | 1492143868674196924 |
| 15 | 91466801447468838337 |
| 16 | 6002791454773440431245 |
| 17 | 419938013721629866235476 |
[1,1,4,37,505,9076,202519,5397337,167237410, 5906437651,234185226409,10299442379062, 497567448860365,26191947311138701, 1492143868674196924,91466801447468838337, 6002791454773440431245,419938013721629866235476] |