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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 330 |
| 3 | 9010 |
| 4 | 288240 |
| 5 | 10473072 |
| 6 | 423446080 |
| 7 | 18775484160 |
| 8 | 903038514720 |
| 9 | 46713885798880 |
| 10 | 2581318186453824 |
| 11 | 151514025671607360 |
| 12 | 9402355792409835520 |
| 13 | 614406453498776970240 |
| 14 | 42132162349935136988160 |
[1,15,330,9010,288240,10473072,423446080, 18775484160,903038514720,46713885798880, 2581318186453824,151514025671607360, 9402355792409835520,614406453498776970240, 42132162349935136988160] |