n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 15 |
4 | 127 |
5 | 1006 |
6 | 8230 |
7 | 70320 |
8 | 614821 |
9 | 5453140 |
10 | 48982456 |
11 | 444608278 |
12 | 4070532710 |
13 | 37535715441 |
14 | 348245215460 |
15 | 3247889171908 |
16 | 30429496751905 |
17 | 286235215995588 |
18 | 2702000272361599 |
19 | 25586688305447928 |
20 | 242978340446949438 |
21 | 2313264023790027111 |
22 | 22074118786158858975 |
[0,1,15,127,1006,8230,70320,614821,5453140, 48982456,444608278,4070532710,37535715441, 348245215460,3247889171908,30429496751905, 286235215995588,2702000272361599, 25586688305447928,242978340446949438, 2313264023790027111,22074118786158858975] |