n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 45 |
5 | 174 |
6 | 693 |
7 | 2891 |
8 | 12156 |
9 | 52538 |
10 | 228973 |
11 | 1012996 |
12 | 4518961 |
13 | 20342820 |
14 | 92221108 |
15 | 420719274 |
16 | 1930067929 |
17 | 8897118329 |
18 | 41194214136 |
19 | 191470957420 |
20 | 893110958485 |
21 | 4179139628301 |
22 | 19612391986898 |
23 | 92283693683299 |
24 | 435288156265051 |
25 | 2057796624112995 |
26 | 9748277239594671 |
27 | 46268733559268079 |
[1,1,4,12,45,174,693,2891,12156,52538,228973, 1012996,4518961,20342820,92221108,420719274, 1930067929,8897118329,41194214136,191470957420, 893110958485,4179139628301,19612391986898, 92283693683299,435288156265051,2057796624112995, 9748277239594671,46268733559268079] |