n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 12 |
5 | 660 |
6 | 20400 |
7 | 445620 |
8 | 7977732 |
9 | 126860580 |
10 | 1873839000 |
11 | 26381789940 |
12 | 359484471852 |
13 | 4784481401700 |
14 | 62538498859200 |
15 | 805447464281460 |
16 | 10241415118476372 |
17 | 128722997969290020 |
18 | 1600670708273985000 |
19 | 19705915838479512180 |
20 | 240330009637668935292 |
[0,0,0,0,12,660,20400,445620,7977732,126860580, 1873839000,26381789940,359484471852,4784481401700, 62538498859200,805447464281460,10241415118476372, 128722997969290020,1600670708273985000, 19705915838479512180,240330009637668935292] |