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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 30 |
| 3 | 330 |
| 4 | 4080 |
| 5 | 53130 |
| 6 | 712530 |
| 7 | 9738960 |
| 8 | 134891640 |
| 9 | 1886744970 |
| 10 | 26589681300 |
| 11 | 376970137830 |
| 12 | 5370413979840 |
| 13 | 76816421507280 |
| 14 | 1102478371452150 |
| 15 | 15868672192650600 |
| 16 | 228978369822304080 |
| 17 | 3311260421942706570 |
[1,5,30,330,4080,53130,712530,9738960,134891640, 1886744970,26589681300,376970137830,5370413979840, 76816421507280,1102478371452150,15868672192650600, 228978369822304080,3311260421942706570] |