n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 5 |
7 | 12 |
8 | 39 |
9 | 136 |
10 | 529 |
11 | 2171 |
12 | 9368 |
13 | 41534 |
14 | 188942 |
15 | 874906 |
16 | 4115060 |
17 | 19602156 |
18 | 94419351 |
19 | 459183768 |
20 | 2252217207 |
21 | 11130545494 |
22 | 55382155396 |
23 | 277255622646 |
24 | 1395731021610 |
25 | 7061871805974 |
26 | 35896206800034 |
27 | 183241761631584 |
[0,1,1,1,2,5,12,39,136,529,2171,9368,41534,188942, 874906,4115060,19602156,94419351,459183768, 2252217207,11130545494,55382155396,277255622646, 1395731021610,7061871805974,35896206800034, 183241761631584] |