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| n | a(n) |
|---|---|
| 1 | 972 |
| 2 | 15564 |
| 3 | 253068 |
| 4 | 4136292 |
| 5 | 67731264 |
| 6 | 1109832180 |
| 7 | 18189909480 |
| 8 | 298154846436 |
| 9 | 4887277903812 |
| 10 | 80111933563464 |
| 11 | 1313194979326320 |
| 12 | 21525927546323460 |
| 13 | 352853780193705264 |
| 14 | 5783993041849734792 |
| 15 | 94811448308361126864 |
[972,15564,253068,4136292,67731264,1109832180, 18189909480,298154846436,4887277903812, 80111933563464,1313194979326320,21525927546323460, 352853780193705264,5783993041849734792, 94811448308361126864] |