n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 13 |
6 | 42 |
7 | 139 |
8 | 506 |
9 | 1915 |
10 | 7558 |
11 | 31092 |
12 | 132170 |
13 | 580466 |
14 | 2624545 |
15 | 12190623 |
16 | 58083923 |
17 | 283346273 |
18 | 1413449148 |
19 | 7200961616 |
20 | 37425264180 |
21 | 198239674888 |
22 | 1069228024931 |
23 | 5867587726222 |
24 | 32736878114805 |
25 | 185570805235978 |
[0,0,1,2,4,13,42,139,506,1915,7558,31092,132170, 580466,2624545,12190623,58083923,283346273, 1413449148,7200961616,37425264180,198239674888, 1069228024931,5867587726222,32736878114805, 185570805235978] |