n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 14 |
3 | 40 |
4 | 110 |
5 | 304 |
6 | 854 |
7 | 2440 |
8 | 7070 |
9 | 20704 |
10 | 61094 |
11 | 181240 |
12 | 539630 |
13 | 1610704 |
14 | 4815734 |
15 | 14414440 |
16 | 43177790 |
17 | 129402304 |
18 | 387944774 |
19 | 1163310040 |
20 | 3488881550 |
21 | 10464547504 |
22 | 31389448214 |
23 | 94159956040 |
24 | 282463090910 |
25 | 847355718304 |
[0,4,14,40,110,304,854,2440,7070,20704,61094, 181240,539630,1610704,4815734,14414440,43177790, 129402304,387944774,1163310040,3488881550, 10464547504,31389448214,94159956040,282463090910, 847355718304] |