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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 72 |
| 2 | 5508 |
| 3 | 429624 |
| 4 | 33832890 |
| 5 | 2679564888 |
| 6 | 213025408596 |
| 7 | 16981168285224 |
| 8 | 1356370816782267 |
| 9 | 108509665342581360 |
| 10 | 8691624193940766936 |
| 11 | 696910230823250585232 |
| 12 | 55927046023565859464868 |
| 13 | 4491372003738673637024784 |
| 14 | 360913821729000560118063000 |
[1,72,5508,429624,33832890,2679564888, 213025408596,16981168285224,1356370816782267, 108509665342581360,8691624193940766936, 696910230823250585232,55927046023565859464868, 4491372003738673637024784, 360913821729000560118063000] |