The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 40 |
| 2 | 1560 |
| 3 | 60840 |
| 4 | 2372760 |
| 5 | 92537640 |
| 6 | 3608967960 |
| 7 | 140749750440 |
| 8 | 5489240267160 |
| 9 | 214080370419240 |
| 10 | 8349134446350360 |
| 11 | 325616243407664040 |
| 12 | 12699033492898897560 |
| 13 | 495262306223057004840 |
| 14 | 19315229942699223188760 |
[1,40,1560,60840,2372760,92537640,3608967960, 140749750440,5489240267160,214080370419240, 8349134446350360,325616243407664040, 12699033492898897560,495262306223057004840, 19315229942699223188760] |