n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 15 |
5 | 62 |
6 | 274 |
7 | 1260 |
8 | 5973 |
9 | 28975 |
10 | 143176 |
11 | 718070 |
12 | 3645876 |
13 | 18703560 |
14 | 96799076 |
15 | 504797258 |
16 | 2649947859 |
17 | 13992164283 |
18 | 74262871273 |
19 | 395964705460 |
20 | 2119994732940 |
21 | 11392843953996 |
22 | 61432524907686 |
23 | 332279234332898 |
24 | 1802324611950162 |
[1,1,1,4,15,62,274,1260,5973,28975,143176,718070, 3645876,18703560,96799076,504797258,2649947859, 13992164283,74262871273,395964705460, 2119994732940,11392843953996,61432524907686, 332279234332898,1802324611950162] |