n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 24 |
4 | 68 |
5 | 406 |
6 | 1584 |
7 | 7790 |
8 | 33630 |
9 | 156032 |
10 | 695344 |
11 | 3168922 |
12 | 14262616 |
13 | 64640674 |
14 | 291830210 |
15 | 1320357280 |
16 | 5966652996 |
17 | 26981170086 |
18 | 121963213688 |
19 | 551425857374 |
20 | 2492844327694 |
21 | 11270188295640 |
22 | 50950869428672 |
23 | 230346017497690 |
[2,2,24,68,406,1584,7790,33630,156032,695344, 3168922,14262616,64640674,291830210,1320357280, 5966652996,26981170086,121963213688,551425857374, 2492844327694,11270188295640,50950869428672, 230346017497690] |