n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 6 |
7 | 10 |
8 | 29 |
9 | 57 |
10 | 142 |
11 | 309 |
12 | 720 |
13 | 1625 |
14 | 3714 |
15 | 8457 |
16 | 19259 |
17 | 43902 |
18 | 99970 |
19 | 227830 |
20 | 518943 |
21 | 1182401 |
22 | 2693624 |
23 | 6136837 |
24 | 13980960 |
25 | 31851853 |
26 | 72565704 |
27 | 165320833 |
28 | 376638417 |
29 | 858066430 |
30 | 1954869262 |
31 | 4453630790 |
32 | 10146374277 |
33 | 23115721705 |
[1,0,1,1,2,6,10,29,57,142,309,720,1625,3714,8457, 19259,43902,99970,227830,518943,1182401,2693624, 6136837,13980960,31851853,72565704,165320833, 376638417,858066430,1954869262,4453630790, 10146374277,23115721705] |