n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 19 |
5 | 99 |
6 | 603 |
7 | 4248 |
8 | 34115 |
9 | 307875 |
10 | 3085203 |
11 | 33993870 |
12 | 408482695 |
13 | 5316309607 |
14 | 74499953255 |
15 | 1118421967520 |
16 | 17907571955927 |
17 | 304619809031127 |
18 | 5486197279305911 |
19 | 104289196264058030 |
20 | 2086706157642260387 |
21 | 43838287730208552691 |
22 | 964790364323910060691 |
[0,0,1,4,19,99,603,4248,34115,307875,3085203, 33993870,408482695,5316309607,74499953255, 1118421967520,17907571955927,304619809031127, 5486197279305911,104289196264058030, 2086706157642260387,43838287730208552691, 964790364323910060691] |