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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 1 |
| 3 | 7 |
| 4 | 61 |
| 5 | 1932 |
| 6 | 141961 |
| 7 | 28616232 |
| 8 | 14835905701 |
| 9 | 20274223678327 |
| 10 | 72347321822391001 |
| 11 | 676560511993808919302 |
| 12 | 16557761623387534111504801 |
| 13 | 1061047233926922264334773774782 |
| 14 | 177999626303093264515509668491829161 |
| 15 | 78178603961589153039675223631587252222807 |
[1,2,1,7,61,1932,141961,28616232,14835905701, 20274223678327,72347321822391001, 676560511993808919302,16557761623387534111504801, 1061047233926922264334773774782, 177999626303093264515509668491829161, 78178603961589153039675223631587252222807] |