n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 26 |
6 | 76 |
7 | 232 |
8 | 688 |
9 | 1950 |
10 | 5434 |
11 | 14910 |
12 | 40840 |
13 | 112063 |
14 | 309829 |
15 | 859684 |
16 | 2389776 |
17 | 6643900 |
18 | 18460796 |
19 | 51248304 |
20 | 142167544 |
21 | 394279264 |
22 | 1093484420 |
23 | 3033005340 |
24 | 8413870972 |
25 | 23343324312 |
26 | 64766314089 |
27 | 179693948237 |
28 | 498548997886 |
29 | 1383158961636 |
[1,1,2,4,10,26,76,232,688,1950,5434,14910,40840, 112063,309829,859684,2389776,6643900,18460796, 51248304,142167544,394279264,1093484420, 3033005340,8413870972,23343324312,64766314089, 179693948237,498548997886,1383158961636] |