n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 115 |
9 | 286 |
10 | 718 |
11 | 1832 |
12 | 4702 |
13 | 12159 |
14 | 31515 |
15 | 81888 |
16 | 212878 |
17 | 553557 |
18 | 1438741 |
19 | 3737331 |
20 | 9700188 |
21 | 25156049 |
22 | 65181067 |
23 | 168746672 |
24 | 436505846 |
25 | 1128256918 |
26 | 2914103577 |
27 | 7521450053 |
28 | 19400577711 |
29 | 50010551503 |
30 | 128841990772 |
31 | 331754004302 |
[1,1,1,2,4,9,20,48,115,286,718,1832,4702,12159, 31515,81888,212878,553557,1438741,3737331,9700188, 25156049,65181067,168746672,436505846,1128256918, 2914103577,7521450053,19400577711,50010551503, 128841990772,331754004302] |