n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 4 |
5 | 14 |
6 | 38 |
7 | 132 |
8 | 420 |
9 | 1426 |
10 | 4834 |
11 | 16796 |
12 | 58688 |
13 | 208012 |
14 | 742636 |
15 | 2674384 |
16 | 9693976 |
17 | 35357670 |
18 | 129641774 |
19 | 477638700 |
20 | 1767253368 |
21 | 6564119892 |
22 | 24466233428 |
23 | 91482563640 |
24 | 343059494120 |
25 | 1289904147128 |
26 | 4861945985428 |
27 | 18367353066440 |
28 | 69533549429280 |
29 | 263747951750360 |
[1,2,4,14,38,132,420,1426,4834,16796,58688,208012, 742636,2674384,9693976,35357670,129641774, 477638700,1767253368,6564119892,24466233428, 91482563640,343059494120,1289904147128, 4861945985428,18367353066440,69533549429280, 263747951750360] |