n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 6 |
6 | 0 |
7 | 3 |
8 | 51 |
9 | 42 |
10 | 117 |
11 | 453 |
12 | 615 |
13 | 1509 |
14 | 4665 |
15 | 9159 |
16 | 22542 |
17 | 61659 |
18 | 143013 |
19 | 359028 |
20 | 942234 |
21 | 2362140 |
22 | 6096888 |
23 | 16004478 |
24 | 41649720 |
25 | 109662291 |
26 | 290536845 |
27 | 769577400 |
28 | 2049110310 |
29 | 5470439130 |
30 | 14619639972 |
31 | 39172342518 |
[0,0,6,0,3,51,42,117,453,615,1509,4665,9159,22542, 61659,143013,359028,942234,2362140,6096888, 16004478,41649720,109662291,290536845,769577400, 2049110310,5470439130,14619639972,39172342518] |