The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 24 |
| 3 | 84 |
| 4 | 120 |
| 5 | 672 |
| 6 | 24384 |
| 7 | 43065 |
| 8 | 78975 |
| 9 | 81081 |
| 10 | 261261 |
| 11 | 523776 |
| 12 | 9124731 |
| 13 | 13398021 |
| 14 | 69087249 |
| 15 | 91963648 |
| 16 | 459818240 |
| 17 | 39142675143 |
| 18 | 51001180160 |
[12,24,84,120,672,24384,43065,78975,81081,261261, 523776,9124731,13398021,69087249,91963648, 459818240,39142675143,51001180160] |