n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 6 |
4 | 22 |
5 | 78 |
6 | 278 |
7 | 990 |
8 | 3526 |
9 | 12558 |
10 | 44726 |
11 | 159294 |
12 | 567334 |
13 | 2020590 |
14 | 7196438 |
15 | 25630494 |
16 | 91284358 |
17 | 325114062 |
18 | 1157910902 |
19 | 4123960830 |
20 | 14687704294 |
21 | 52311034542 |
22 | 186308512214 |
23 | 663547605726 |
24 | 2363259841606 |
25 | 8416874736270 |
26 | 29977143892022 |
27 | 106765181148606 |
[0,2,6,22,78,278,990,3526,12558,44726,159294, 567334,2020590,7196438,25630494,91284358, 325114062,1157910902,4123960830,14687704294, 52311034542,186308512214,663547605726, 2363259841606,8416874736270,29977143892022, 106765181148606] |