n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 0 |
4 | 6 |
5 | 21 |
6 | 114 |
7 | 597 |
8 | 3278 |
9 | 18420 |
10 | 105618 |
11 | 615331 |
12 | 3632352 |
13 | 21678975 |
14 | 130598887 |
15 | 793085742 |
16 | 4849791942 |
17 | 29838388707 |
18 | 184573315170 |
19 | 1147219365762 |
20 | 7161284719412 |
21 | 44876343104655 |
22 | 282206695488603 |
23 | 1780341161583746 |
24 | 11264338644455334 |
25 | 71461150894269030 |
[0,0,1,0,6,21,114,597,3278,18420,105618,615331, 3632352,21678975,130598887,793085742,4849791942, 29838388707,184573315170,1147219365762, 7161284719412,44876343104655,282206695488603, 1780341161583746,11264338644455334, 71461150894269030] |