n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 36 |
3 | 540 |
4 | 6080 |
5 | 56250 |
6 | 455112 |
7 | 3342192 |
8 | 22809600 |
9 | 146988270 |
10 | 904475000 |
11 | 5358254616 |
12 | 30750385536 |
13 | 171773279860 |
14 | 937514244240 |
15 | 5014575000000 |
16 | 26351064760320 |
17 | 136319273714070 |
18 | 695429503781400 |
19 | 3503580441563400 |
20 | 17452918098000000 |
21 | 86055711108818220 |
[0,1,36,540,6080,56250,455112,3342192,22809600, 146988270,904475000,5358254616,30750385536, 171773279860,937514244240,5014575000000, 26351064760320,136319273714070,695429503781400, 3503580441563400,17452918098000000, 86055711108818220] |