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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 55 |
| 2 | 237472 |
| 3 | 371654153 |
| 4 | 757341382671 |
| 5 | 1450226501771584 |
| 6 | 2820152941289640505 |
| 7 | 5463664833842177843423 |
| 8 | 10594819370472223969569120 |
| 9 | 20540255065209806005525289313 |
| 10 | 39823725482559144291828665014967 |
| 11 | 77209746313875957204633819730760448 |
[1,55,237472,371654153,757341382671, 1450226501771584,2820152941289640505, 5463664833842177843423,10594819370472223969569120, 20540255065209806005525289313, 39823725482559144291828665014967, 77209746313875957204633819730760448] |