n | a(n) |
---|---|
0 | 0 |
1 | 7 |
2 | 56 |
3 | 399 |
4 | 2800 |
5 | 19607 |
6 | 137256 |
7 | 960799 |
8 | 6725600 |
9 | 47079207 |
10 | 329554456 |
11 | 2306881199 |
12 | 16148168400 |
13 | 113037178807 |
14 | 791260251656 |
15 | 5538821761599 |
16 | 38771752331200 |
17 | 271402266318407 |
18 | 1899815864228856 |
19 | 13298711049601999 |
20 | 93090977347214000 |
21 | 651636841430498007 |
[0,7,56,399,2800,19607,137256,960799,6725600, 47079207,329554456,2306881199,16148168400, 113037178807,791260251656,5538821761599, 38771752331200,271402266318407,1899815864228856, 13298711049601999,93090977347214000, 651636841430498007] |