n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 17 |
5 | 52 |
6 | 167 |
7 | 558 |
8 | 1912 |
9 | 6683 |
10 | 23736 |
11 | 85426 |
12 | 310861 |
13 | 1141837 |
14 | 4227938 |
15 | 15764474 |
16 | 59140089 |
17 | 223062670 |
18 | 845388258 |
19 | 3217750229 |
20 | 12295043520 |
21 | 47144444476 |
22 | 181349473833 |
23 | 699629022954 |
24 | 2706327445312 |
25 | 10494497061015 |
26 | 40787775234746 |
27 | 158859378070721 |
[1,1,2,6,17,52,167,558,1912,6683,23736,85426, 310861,1141837,4227938,15764474,59140089, 223062670,845388258,3217750229,12295043520, 47144444476,181349473833,699629022954, 2706327445312,10494497061015,40787775234746, 158859378070721] |