n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 12 |
5 | 20 |
6 | 1830 |
7 | 15162 |
8 | 82376 |
9 | 3326472 |
10 | 59467050 |
11 | 678585710 |
12 | 20553790092 |
13 | 563969783676 |
14 | 10776243950654 |
15 | 318310813941330 |
16 | 10988438698692240 |
17 | 303144002003606672 |
18 | 9910024990673571666 |
19 | 392381835437286982998 |
20 | 14072003919511407720020 |
[1,0,0,6,12,20,1830,15162,82376,3326472,59467050, 678585710,20553790092,563969783676,10776243950654, 318310813941330,10988438698692240, 303144002003606672,9910024990673571666, 392381835437286982998,14072003919511407720020] |