n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 38 |
3 | 252 |
4 | 1740 |
5 | 12456 |
6 | 92136 |
7 | 702288 |
8 | 5503632 |
9 | 44258400 |
10 | 364615776 |
11 | 3072862656 |
12 | 26458723008 |
13 | 232501041792 |
14 | 2082933048960 |
15 | 19007627463936 |
16 | 176533756252416 |
17 | 1667446616360448 |
18 | 16006827410744832 |
19 | 156069042653445120 |
[1,6,38,252,1740,12456,92136,702288,5503632, 44258400,364615776,3072862656,26458723008, 232501041792,2082933048960,19007627463936, 176533756252416,1667446616360448, 16006827410744832,156069042653445120] |