n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 4 |
3 | 6 |
4 | 20 |
5 | 49 |
6 | 132 |
7 | 344 |
8 | 908 |
9 | 2384 |
10 | 6273 |
11 | 16492 |
12 | 43372 |
13 | 114050 |
14 | 299916 |
15 | 788673 |
16 | 2073944 |
17 | 5453760 |
18 | 14341528 |
19 | 37713312 |
20 | 99173121 |
21 | 260791400 |
22 | 685792228 |
23 | 1803399102 |
24 | 4742323108 |
25 | 12470688497 |
26 | 32793647356 |
27 | 86236081272 |
28 | 226771411940 |
29 | 596331286320 |
[1,0,4,6,20,49,132,344,908,2384,6273,16492,43372, 114050,299916,788673,2073944,5453760,14341528, 37713312,99173121,260791400,685792228,1803399102, 4742323108,12470688497,32793647356,86236081272, 226771411940,596331286320] |