n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 2 |
6 | 6 |
7 | 20 |
8 | 60 |
9 | 176 |
10 | 512 |
11 | 1488 |
12 | 4326 |
13 | 12648 |
14 | 37186 |
15 | 109980 |
16 | 327216 |
17 | 979020 |
18 | 2944414 |
19 | 8897732 |
20 | 27005290 |
21 | 82288516 |
22 | 251650788 |
23 | 772127678 |
24 | 2376238138 |
25 | 7333188770 |
26 | 22688297950 |
27 | 70360977228 |
28 | 218678818026 |
29 | 681017928476 |
30 | 2124840874610 |
31 | 6641336507270 |
32 | 20791999731518 |
[0,0,0,0,2,6,20,60,176,512,1488,4326,12648,37186, 109980,327216,979020,2944414,8897732,27005290, 82288516,251650788,772127678,2376238138, 7333188770,22688297950,70360977228,218678818026, 681017928476,2124840874610,6641336507270, 20791999731518] |