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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 152 |
| 4 | 7684 |
| 5 | 1352096 |
| 6 | 852120928 |
| 7 | 1960591940480 |
| 8 | 16697154282192928 |
| 9 | 531801639623740649984 |
| 10 | 63854080509077223292639744 |
| 11 | 29089348119991257994736112048128 |
[1,2,10,152,7684,1352096,852120928,1960591940480, 16697154282192928,531801639623740649984, 63854080509077223292639744, 29089348119991257994736112048128] |