n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 25 |
6 | 89 |
7 | 301 |
8 | 960 |
9 | 3024 |
10 | 9305 |
11 | 28501 |
12 | 86430 |
13 | 261625 |
14 | 788669 |
15 | 2375075 |
16 | 7140720 |
17 | 21457825 |
18 | 64435896 |
19 | 193448101 |
20 | 580597110 |
21 | 1742343323 |
22 | 5228050949 |
23 | 15686335501 |
24 | 47063113320 |
25 | 141197991000 |
26 | 423610488665 |
27 | 1270865802276 |
28 | 3812663735790 |
29 | 11438127792025 |
30 | 34314649427035 |
[0,0,1,6,25,89,301,960,3024,9305,28501,86430, 261625,788669,2375075,7140720,21457825,64435896, 193448101,580597110,1742343323,5228050949, 15686335501,47063113320,141197991000,423610488665, 1270865802276,3812663735790,11438127792025, 34314649427035] |