n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 4 |
7 | 13 |
8 | 46 |
9 | 144 |
10 | 420 |
11 | 1221 |
12 | 3474 |
13 | 9856 |
14 | 27794 |
15 | 78632 |
16 | 222156 |
17 | 629760 |
18 | 1787440 |
19 | 5087797 |
20 | 14509580 |
21 | 41479867 |
22 | 118811286 |
23 | 341009901 |
24 | 980488510 |
25 | 2824029648 |
26 | 8146494860 |
27 | 23534997912 |
28 | 68084154502 |
29 | 197211336576 |
30 | 571915188840 |
31 | 1660405181149 |
32 | 4825559508106 |
33 | 14038010213051 |
34 | 40875403561680 |
35 | 119122661856133 |
36 | 347441159864556 |
37 | 1014152747485696 |
[0,0,0,0,0,4,13,46,144,420,1221,3474,9856,27794, 78632,222156,629760,1787440,5087797,14509580, 41479867,118811286,341009901,980488510,2824029648, 8146494860,23534997912,68084154502,197211336576, 571915188840,1660405181149,4825559508106, 14038010213051,40875403561680,119122661856133, 347441159864556,1014152747485696] |