n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 15 |
3 | 120 |
4 | 3060 |
5 | 278256 |
6 | 90858768 |
7 | 105637584000 |
8 | 436355999662176 |
9 | 6431591598617108352 |
10 | 340881559632021623909760 |
11 | 65533747894341651530074060800 |
12 | 46081376018330435634530315478453248 |
[1,4,15,120,3060,278256,90858768,105637584000, 436355999662176,6431591598617108352, 340881559632021623909760, 65533747894341651530074060800, 46081376018330435634530315478453248] |