n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 20 |
7 | 210 |
8 | 1400 |
9 | 7560 |
10 | 36120 |
11 | 159390 |
12 | 1035100 |
13 | 17082780 |
14 | 329893564 |
15 | 5336661330 |
16 | 73265956400 |
17 | 889068944400 |
18 | 9968073461616 |
19 | 112902000191334 |
20 | 1531070090032500 |
21 | 27610559023112100 |
22 | 586336131631313140 |
23 | 12550716321612658266 |
24 | 254052845940651258600 |
[1,0,0,0,0,0,20,210,1400,7560,36120,159390, 1035100,17082780,329893564,5336661330,73265956400, 889068944400,9968073461616,112902000191334, 1531070090032500,27610559023112100, 586336131631313140,12550716321612658266, 254052845940651258600] |