n | a(n) |
---|---|
2 | 1 |
3 | 0 |
4 | 0 |
5 | 3 |
6 | 13 |
7 | 30 |
8 | 61 |
9 | 172 |
10 | 619 |
11 | 2241 |
12 | 7736 |
13 | 25786 |
14 | 85315 |
15 | 286653 |
16 | 986444 |
17 | 3465777 |
18 | 12342188 |
19 | 44275218 |
20 | 159463056 |
21 | 576136367 |
22 | 2089063623 |
23 | 7607265038 |
24 | 27829092314 |
25 | 102263653872 |
26 | 377340952123 |
27 | 1397457667346 |
28 | 5192248524833 |
29 | 19348310336881 |
30 | 72292940817636 |
[1,0,0,3,13,30,61,172,619,2241,7736,25786,85315, 286653,986444,3465777,12342188,44275218,159463056, 576136367,2089063623,7607265038,27829092314, 102263653872,377340952123,1397457667346, 5192248524833,19348310336881,72292940817636] |