n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 8 |
3 | 21 |
4 | 54 |
5 | 144 |
6 | 404 |
7 | 1195 |
8 | 3712 |
9 | 12000 |
10 | 39994 |
11 | 136400 |
12 | 473430 |
13 | 1665868 |
14 | 5926476 |
15 | 21275805 |
16 | 76964808 |
17 | 280250088 |
18 | 1026309908 |
19 | 3777411342 |
20 | 13965286180 |
21 | 51837285776 |
22 | 193107846304 |
23 | 721732334136 |
24 | 2705480787422 |
25 | 10169387310362 |
26 | 38320472420462 |
27 | 144733083435688 |
[1,3,8,21,54,144,404,1195,3712,12000,39994,136400, 473430,1665868,5926476,21275805,76964808, 280250088,1026309908,3777411342,13965286180, 51837285776,193107846304,721732334136, 2705480787422,10169387310362,38320472420462, 144733083435688] |