n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 1 |
7 | 1 |
8 | 2 |
9 | 5 |
10 | 15 |
11 | 64 |
12 | 342 |
13 | 2321 |
14 | 18578 |
15 | 168287 |
16 | 1656209 |
17 | 17288336 |
18 | 188006362 |
19 | 2105867058 |
20 | 24108331027 |
21 | 280638347609 |
22 | 3310098377912 |
23 | 39462525169310 |
24 | 474697793413215 |
25 | 5754095507495584 |
26 | 70216415130786725 |
27 | 861924378411516159 |
28 | 10636562125193377459 |
[0,0,0,0,1,1,1,2,5,15,64,342,2321,18578,168287, 1656209,17288336,188006362,2105867058,24108331027, 280638347609,3310098377912,39462525169310, 474697793413215,5754095507495584, 70216415130786725,861924378411516159, 10636562125193377459] |