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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 57 |
| 5 | 2801 |
| 6 | 139658 |
| 7 | 47216065 |
| 8 | 16477840107 |
| 9 | 38900937658402 |
| 10 | 95030370064332109 |
| 11 | 1569888180568718888123 |
| 12 | 26845297334664927227358264 |
| 13 | 3104208728255475471662060331653 |
| 14 | 371576574614065326331102018605110717 |
[0,1,1,8,57,2801,139658,47216065,16477840107, 38900937658402,95030370064332109, 1569888180568718888123,26845297334664927227358264, 3104208728255475471662060331653, 371576574614065326331102018605110717] |