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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 68 |
| 4 | 2251 |
| 5 | 247016 |
| 6 | 89254228 |
| 7 | 108168781424 |
| 8 | 451141297789858 |
| 9 | 6625037125817801312 |
| 10 | 348562672319990399962384 |
| 11 | 66545827618461283102105245248 |
| 12 | 46543235997095840080425299916917968 |
| 13 | 120155975713532210671953821005746669185792 |
| 14 | 1152009540439950050422144845158703009569109376384 |
[1,2,7,68,2251,247016,89254228,108168781424, 451141297789858,6625037125817801312, 348562672319990399962384, 66545827618461283102105245248, 46543235997095840080425299916917968, 120155975713532210671953821005746669185792, 1152009540439950050422144845158703009569109376384] |