n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 16 |
4 | 59 |
5 | 214 |
6 | 768 |
7 | 2745 |
8 | 9792 |
9 | 34900 |
10 | 124339 |
11 | 442906 |
12 | 1577540 |
13 | 5618665 |
14 | 20011452 |
15 | 71272296 |
16 | 253840779 |
17 | 904068526 |
18 | 3219889720 |
19 | 11467810393 |
20 | 40843217384 |
21 | 145465283884 |
22 | 518082304131 |
23 | 1845177508818 |
24 | 6571697181084 |
25 | 23405446635913 |
26 | 83359734391300 |
27 | 296890096642144 |
[1,4,16,59,214,768,2745,9792,34900,124339,442906, 1577540,5618665,20011452,71272296,253840779, 904068526,3219889720,11467810393,40843217384, 145465283884,518082304131,1845177508818, 6571697181084,23405446635913,83359734391300, 296890096642144] |