n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 110 |
4 | 960 |
5 | 12502 |
6 | 136952 |
7 | 1746558 |
8 | 20951040 |
9 | 267467294 |
10 | 3347043208 |
11 | 43051344074 |
12 | 550991269824 |
13 | 7146318966438 |
14 | 92706899799480 |
15 | 1211369977374310 |
16 | 15857138035286016 |
17 | 208493724775866726 |
18 | 2747100161210031944 |
19 | 36305149229744449050 |
20 | 480750961929272288960 |
[1,2,8,110,960,12502,136952,1746558,20951040, 267467294,3347043208,43051344074,550991269824, 7146318966438,92706899799480,1211369977374310, 15857138035286016,208493724775866726, 2747100161210031944,36305149229744449050, 480750961929272288960] |