n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 6 |
6 | 14 |
7 | 36 |
8 | 93 |
9 | 252 |
10 | 661 |
11 | 1782 |
12 | 4893 |
13 | 13608 |
14 | 37890 |
15 | 106142 |
16 | 298755 |
17 | 844182 |
18 | 2391732 |
19 | 6797196 |
20 | 19371684 |
21 | 55348596 |
22 | 158491993 |
23 | 454795398 |
24 | 1307534319 |
25 | 3765720066 |
26 | 10862647236 |
27 | 31381000560 |
28 | 90780846494 |
29 | 262951692390 |
[0,0,0,1,6,14,36,93,252,661,1782,4893,13608,37890, 106142,298755,844182,2391732,6797196,19371684, 55348596,158491993,454795398,1307534319, 3765720066,10862647236,31381000560,90780846494, 262951692390] |