n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 6 |
3 | 31 |
4 | 167 |
5 | 806 |
6 | 3588 |
7 | 15233 |
8 | 62973 |
9 | 256504 |
10 | 1036274 |
11 | 4167659 |
12 | 16719843 |
13 | 66985946 |
14 | 268173264 |
15 | 1073184709 |
16 | 4293787577 |
17 | 17177378732 |
18 | 68714233758 |
19 | 274866896783 |
20 | 1099488558975 |
21 | 4397998276462 |
22 | 17592085380956 |
23 | 70368534462281 |
24 | 281474540502837 |
25 | 1125899000872736 |
[0,2,6,31,167,806,3588,15233,62973,256504,1036274, 4167659,16719843,66985946,268173264,1073184709, 4293787577,17177378732,68714233758,274866896783, 1099488558975,4397998276462,17592085380956, 70368534462281,281474540502837,1125899000872736] |