n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 18 |
6 | 79 |
7 | 462 |
8 | 4344 |
9 | 69130 |
10 | 1994511 |
11 | 106159534 |
12 | 10456891547 |
13 | 1904341902688 |
14 | 641869332391172 |
15 | 401549418479234409 |
16 | 467956969039256753054 |
17 | 1019786043659665470506946 |
18 | 4171198012616858743636651785 |
19 | 32134630668466555232483869886654 |
[0,1,2,6,18,79,462,4344,69130,1994511,106159534, 10456891547,1904341902688,641869332391172, 401549418479234409,467956969039256753054, 1019786043659665470506946, 4171198012616858743636651785, 32134630668466555232483869886654] |