n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 11 |
4 | 46 |
5 | 174 |
6 | 740 |
7 | 3109 |
8 | 13614 |
9 | 59878 |
10 | 268728 |
11 | 1214032 |
12 | 5546558 |
13 | 25498422 |
14 | 118054700 |
15 | 549367029 |
16 | 2569472992 |
17 | 12066493332 |
18 | 56883907318 |
19 | 269035738044 |
20 | 1276275732442 |
21 | 6070582701920 |
22 | 28945492531456 |
23 | 138319277521604 |
24 | 662316708110916 |
25 | 3177211680848070 |
26 | 15267484859916084 |
27 | 73479492803233664 |
[1,1,4,11,46,174,740,3109,13614,59878,268728, 1214032,5546558,25498422,118054700,549367029, 2569472992,12066493332,56883907318,269035738044, 1276275732442,6070582701920,28945492531456, 138319277521604,662316708110916,3177211680848070, 15267484859916084,73479492803233664] |