n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 23 |
6 | 57 |
7 | 138 |
8 | 332 |
9 | 798 |
10 | 1920 |
11 | 4626 |
12 | 11157 |
13 | 26925 |
14 | 64997 |
15 | 156921 |
16 | 378861 |
17 | 914692 |
18 | 2208324 |
19 | 5331444 |
20 | 12871324 |
21 | 31074180 |
22 | 75019701 |
23 | 181113471 |
24 | 437246349 |
25 | 1055605659 |
26 | 2548456957 |
27 | 6152518758 |
28 | 14853493752 |
29 | 35859505946 |
30 | 86572506132 |
31 | 209004519918 |
[0,0,1,3,9,23,57,138,332,798,1920,4626,11157, 26925,64997,156921,378861,914692,2208324,5331444, 12871324,31074180,75019701,181113471,437246349, 1055605659,2548456957,6152518758,14853493752, 35859505946,86572506132,209004519918] |