n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 48 |
5 | 165 |
6 | 711 |
7 | 2765 |
8 | 12230 |
9 | 50199 |
10 | 227229 |
11 | 970714 |
12 | 4459345 |
13 | 19565405 |
14 | 90903964 |
15 | 406827818 |
16 | 1906585122 |
17 | 8662077597 |
18 | 40874264328 |
19 | 187908308360 |
20 | 891647946915 |
21 | 4138130214503 |
22 | 19726740618496 |
23 | 92263851819229 |
24 | 441537841755276 |
25 | 2078452663508263 |
26 | 9979603884251570 |
27 | 47232397814709432 |
[1,1,4,12,48,165,711,2765,12230,50199,227229, 970714,4459345,19565405,90903964,406827818, 1906585122,8662077597,40874264328,187908308360, 891647946915,4138130214503,19726740618496, 92263851819229,441537841755276,2078452663508263, 9979603884251570,47232397814709432] |