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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 106 |
| 4 | 1736 |
| 5 | 38414 |
| 6 | 1073178 |
| 7 | 36281032 |
| 8 | 1441336688 |
| 9 | 65849949118 |
| 10 | 3403003693310 |
| 11 | 196336487214234 |
| 12 | 12513043615743360 |
| 13 | 873250527590532680 |
| 14 | 66241197525447027832 |
| 15 | 5427563864923583687376 |
| 16 | 477771405475710621697632 |
| 17 | 44970647131664087237328798 |
| 18 | 4507506792104658670610331462 |
[1,2,10,106,1736,38414,1073178,36281032, 1441336688,65849949118,3403003693310, 196336487214234,12513043615743360, 873250527590532680,66241197525447027832, 5427563864923583687376,477771405475710621697632, 44970647131664087237328798, 4507506792104658670610331462] |