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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 55 |
| 3 | 9064 |
| 4 | 1480479 |
| 5 | 3140319 |
| 6 | 512899624 |
| 7 | 83770465015 |
| 8 | 13681996386240 |
| 9 | 29021570410560 |
| 10 | 4740012143979895 |
| 11 | 774172961946305704 |
| 12 | 126443510439085951839 |
| 13 | 268205687063091955359 |
| 14 | 43805286749779801393384 |
| 15 | 7154595296776971135630775 |
| 16 | 1168540093186822172351633280 |
[0,55,9064,1480479,3140319,512899624,83770465015, 13681996386240,29021570410560,4740012143979895, 774172961946305704,126443510439085951839, 268205687063091955359,43805286749779801393384, 7154595296776971135630775, 1168540093186822172351633280] |