n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 12 |
4 | 12 |
5 | 60 |
6 | 252 |
7 | 636 |
8 | 2364 |
9 | 7932 |
10 | 25020 |
11 | 85116 |
12 | 280380 |
13 | 921084 |
14 | 3063996 |
15 | 10112892 |
16 | 33421884 |
17 | 110641404 |
18 | 365683644 |
19 | 1209311868 |
20 | 3999743292 |
21 | 13225194492 |
22 | 43735910076 |
23 | 144633607548 |
24 | 478279581756 |
25 | 1581644932860 |
[1,0,0,12,12,60,252,636,2364,7932,25020,85116, 280380,921084,3063996,10112892,33421884,110641404, 365683644,1209311868,3999743292,13225194492, 43735910076,144633607548,478279581756, 1581644932860] |