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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 35831808 |
| 2 | 4586471424 |
| 3 | 78364164096 |
| 4 | 587068342272 |
| 5 | 2799360000000 |
| 6 | 10030613004288 |
| 7 | 29509034655744 |
| 8 | 75144747810816 |
| 9 | 171382426877952 |
| 10 | 358318080000000 |
| 11 | 698260569735168 |
| 12 | 1283918464548864 |
| 13 | 2248392813428736 |
[0,35831808,4586471424,78364164096,587068342272, 2799360000000,10030613004288,29509034655744, 75144747810816,171382426877952,358318080000000, 698260569735168,1283918464548864,2248392813428736] |