n | a(n) |
---|---|
2 | 1 |
3 | 1 |
4 | 4 |
5 | 0 |
6 | 15 |
7 | 25 |
8 | 3 |
9 | 0 |
10 | 30 |
11 | 222 |
12 | 226 |
13 | 40 |
14 | 0 |
15 | 30 |
16 | 1230 |
17 | 3670 |
18 | 2706 |
19 | 535 |
20 | 15 |
21 | 0 |
22 | 0 |
23 | 5040 |
24 | 39900 |
25 | 69450 |
26 | 40405 |
27 | 8141 |
28 | 420 |
29 | 0 |
30 | 0 |
31 | 15120 |
32 | 345240 |
33 | 1254960 |
34 | 1498035 |
35 | 722275 |
36 | 142877 |
37 | 9730 |
38 | 105 |
39 | 0 |
40 | 0 |
41 | 30240 |
42 | 2492280 |
43 | 18587520 |
44 | 40701780 |
45 | 36450820 |
46 | 15031204 |
47 | 2871240 |
48 | 226828 |
49 | 5040 |
[1,1,4,0,15,25,3,0,30,222,226,40,0,30,1230,3670, 2706,535,15,0,0,5040,39900,69450,40405,8141,420,0, 0,15120,345240,1254960,1498035,722275,142877,9730, 105,0,0,30240,2492280,18587520,40701780,36450820, 15031204,2871240,226828,5040] |