n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 23 |
4 | 120 |
5 | 641 |
6 | 3404 |
7 | 18103 |
8 | 96240 |
9 | 511681 |
10 | 2720404 |
11 | 14463383 |
12 | 76896360 |
13 | 408829121 |
14 | 2173591004 |
15 | 11556167863 |
16 | 61439808480 |
17 | 326652408961 |
18 | 1736688295204 |
19 | 9233320043543 |
20 | 49090098240600 |
21 | 260993633267201 |
22 | 1387605220753004 |
23 | 7377376315882423 |
[0,1,4,23,120,641,3404,18103,96240,511681,2720404, 14463383,76896360,408829121,2173591004, 11556167863,61439808480,326652408961, 1736688295204,9233320043543,49090098240600, 260993633267201,1387605220753004,7377376315882423] |