n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 9 |
5 | 40 |
6 | 195 |
7 | 1056 |
8 | 6321 |
9 | 41392 |
10 | 293607 |
11 | 2237920 |
12 | 18210093 |
13 | 157329096 |
14 | 1436630091 |
15 | 13810863808 |
16 | 139305550065 |
17 | 1469959371232 |
18 | 16184586405327 |
19 | 185504221191744 |
20 | 2208841954063317 |
21 | 27272621155678840 |
22 | 348586218389733555 |
23 | 4605223387997411872 |
24 | 62797451641106266329 |
25 | 882730631284319415504 |
[0,0,2,9,40,195,1056,6321,41392,293607,2237920, 18210093,157329096,1436630091,13810863808, 139305550065,1469959371232,16184586405327, 185504221191744,2208841954063317, 27272621155678840,348586218389733555, 4605223387997411872,62797451641106266329, 882730631284319415504] |