n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 27 |
6 | 112 |
7 | 453 |
8 | 2137 |
9 | 10691 |
10 | 58435 |
11 | 340187 |
12 | 2110016 |
13 | 13829358 |
14 | 95474679 |
15 | 691538954 |
16 | 5240280999 |
17 | 41432965441 |
18 | 341040295916 |
19 | 2916376121375 |
20 | 25862097370783 |
21 | 237434958512487 |
22 | 2253358056604465 |
23 | 22076003464423853 |
24 | 222979436686398848 |
25 | 2319295172150784296 |
[0,1,2,9,27,112,453,2137,10691,58435,340187, 2110016,13829358,95474679,691538954,5240280999, 41432965441,341040295916,2916376121375, 25862097370783,237434958512487,2253358056604465, 22076003464423853,222979436686398848, 2319295172150784296] |