n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 9 |
6 | 33 |
7 | 135 |
8 | 609 |
9 | 2985 |
10 | 15747 |
11 | 88761 |
12 | 531561 |
13 | 3366567 |
14 | 22462017 |
15 | 157363329 |
16 | 1154257683 |
17 | 8841865833 |
18 | 70573741857 |
19 | 585753925047 |
20 | 5046128460801 |
21 | 45044554041897 |
22 | 416005748766771 |
23 | 3969321053484921 |
24 | 39077616720410409 |
[0,0,1,1,3,9,33,135,609,2985,15747,88761,531561, 3366567,22462017,157363329,1154257683,8841865833, 70573741857,585753925047,5046128460801, 45044554041897,416005748766771,3969321053484921, 39077616720410409] |