n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 15 |
5 | 59 |
6 | 250 |
7 | 1145 |
8 | 5649 |
9 | 29874 |
10 | 168509 |
11 | 1009215 |
12 | 6391484 |
13 | 42648083 |
14 | 298865333 |
15 | 2193219124 |
16 | 16811408659 |
17 | 134289313167 |
18 | 1115559002906 |
19 | 9619253991637 |
20 | 85950089855573 |
21 | 794567157607386 |
22 | 7588822028424393 |
23 | 74783864494826723 |
24 | 759461721024357540 |
[0,1,4,15,59,250,1145,5649,29874,168509,1009215, 6391484,42648083,298865333,2193219124,16811408659, 134289313167,1115559002906,9619253991637, 85950089855573,794567157607386,7588822028424393, 74783864494826723,759461721024357540] |