n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 9 |
5 | 20 |
6 | 64 |
7 | 205 |
8 | 747 |
9 | 2767 |
10 | 10850 |
11 | 43254 |
12 | 176990 |
13 | 735007 |
14 | 3099272 |
15 | 13220407 |
16 | 57001841 |
17 | 248009246 |
18 | 1087947441 |
19 | 4807232915 |
20 | 21381055533 |
21 | 95660032110 |
22 | 430298114499 |
23 | 1945096434552 |
24 | 8832200860663 |
25 | 40271358004756 |
26 | 184325394540531 |
27 | 846667179332120 |
[1,2,3,9,20,64,205,747,2767,10850,43254,176990, 735007,3099272,13220407,57001841,248009246, 1087947441,4807232915,21381055533,95660032110, 430298114499,1945096434552,8832200860663, 40271358004756,184325394540531,846667179332120] |