n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 11 |
4 | 56 |
5 | 348 |
6 | 2578 |
7 | 22054 |
8 | 213798 |
9 | 2313638 |
10 | 27627434 |
11 | 360646314 |
12 | 5107177312 |
13 | 77954299144 |
14 | 1275489929604 |
15 | 22265845018412 |
16 | 412989204564572 |
17 | 8109686585668956 |
18 | 168051656468233972 |
19 | 3664479286118269972 |
20 | 83868072451846938336 |
21 | 2009964340465840802576 |
[1,1,3,11,56,348,2578,22054,213798,2313638, 27627434,360646314,5107177312,77954299144, 1275489929604,22265845018412,412989204564572, 8109686585668956,168051656468233972, 3664479286118269972,83868072451846938336, 2009964340465840802576] |