n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 11 |
5 | 52 |
6 | 304 |
7 | 2114 |
8 | 16992 |
9 | 154626 |
10 | 1568706 |
11 | 17535108 |
12 | 213965520 |
13 | 2828584824 |
14 | 40259041188 |
15 | 613656673476 |
16 | 9971942784132 |
17 | 172071391424832 |
18 | 3141974627361216 |
19 | 60523400730707208 |
20 | 1226519845766281008 |
21 | 26084378634267048984 |
22 | 580854626450078463000 |
[0,0,1,3,11,52,304,2114,16992,154626,1568706, 17535108,213965520,2828584824,40259041188, 613656673476,9971942784132,172071391424832, 3141974627361216,60523400730707208, 1226519845766281008,26084378634267048984, 580854626450078463000] |