n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 504 |
3 | 19656 |
4 | 262080 |
5 | 1953000 |
6 | 10077480 |
7 | 40353264 |
8 | 134217216 |
9 | 387419760 |
10 | 999999000 |
11 | 2357946360 |
12 | 5159778624 |
13 | 10604497176 |
14 | 20661044040 |
15 | 38443356000 |
16 | 68719472640 |
17 | 118587871584 |
18 | 198359284536 |
19 | 322687690920 |
20 | 511999992000 |
21 | 794280037320 |
22 | 1207269207144 |
[0,0,504,19656,262080,1953000,10077480,40353264, 134217216,387419760,999999000,2357946360, 5159778624,10604497176,20661044040,38443356000, 68719472640,118587871584,198359284536, 322687690920,511999992000,794280037320, 1207269207144] |