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| n | a(n) |
|---|---|
| 0 | 2097152 |
| 1 | 612220032 |
| 2 | 13492928512 |
| 3 | 114415582592 |
| 4 | 587068342272 |
| 5 | 2207984167552 |
| 6 | 6722988818432 |
| 7 | 17565568854912 |
| 8 | 40867559636992 |
| 9 | 86812553324672 |
| 10 | 171382426877952 |
| 11 | 318547390056832 |
| 12 | 562949953421312 |
[2097152,612220032,13492928512,114415582592, 587068342272,2207984167552,6722988818432, 17565568854912,40867559636992,86812553324672, 171382426877952,318547390056832,562949953421312] |