n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 6 |
3 | 12 |
4 | 39 |
5 | 104 |
6 | 366 |
7 | 1172 |
8 | 4179 |
9 | 14572 |
10 | 52740 |
11 | 190652 |
12 | 700274 |
13 | 2581112 |
14 | 9591666 |
15 | 35791472 |
16 | 134236179 |
17 | 505290272 |
18 | 1908947406 |
19 | 7233629132 |
20 | 27488079132 |
21 | 104715393912 |
22 | 399823554006 |
23 | 1529755308212 |
24 | 5864066561554 |
25 | 22517998136936 |
26 | 86607703209516 |
[0,2,6,12,39,104,366,1172,4179,14572,52740,190652, 700274,2581112,9591666,35791472,134236179, 505290272,1908947406,7233629132,27488079132, 104715393912,399823554006,1529755308212, 5864066561554,22517998136936,86607703209516] |