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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 214358881 |
| 2 | 54875873536 |
| 3 | 1406408618241 |
| 4 | 14048223625216 |
| 5 | 83733937890625 |
| 6 | 360040606269696 |
| 7 | 1235736291547681 |
| 8 | 3596345248055296 |
| 9 | 9227446944279201 |
| 10 | 21435888100000000 |
| 11 | 45949729863572161 |
| 12 | 92170395205042176 |
[0,214358881,54875873536,1406408618241, 14048223625216,83733937890625,360040606269696, 1235736291547681,3596345248055296, 9227446944279201,21435888100000000, 45949729863572161,92170395205042176] |