n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 21 |
5 | 77 |
6 | 168 |
7 | 609 |
8 | 987 |
9 | 3572 |
10 | 7755 |
11 | 28059 |
12 | 47376 |
13 | 171409 |
14 | 372099 |
15 | 1346268 |
16 | 2178309 |
17 | 7881197 |
18 | 17108664 |
19 | 61899729 |
20 | 104512485 |
21 | 378129724 |
22 | 820851717 |
23 | 2969869413 |
24 | 4809706272 |
25 | 17401680769 |
26 | 37775923491 |
27 | 136674575148 |
[0,1,3,12,21,77,168,609,987,3572,7755,28059,47376, 171409,372099,1346268,2178309,7881197,17108664, 61899729,104512485,378129724,820851717,2969869413, 4809706272,17401680769,37775923491,136674575148] |