n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 40 |
5 | 117 |
6 | 332 |
7 | 921 |
8 | 2512 |
9 | 6761 |
10 | 18004 |
11 | 47525 |
12 | 124536 |
13 | 324317 |
14 | 840092 |
15 | 2166065 |
16 | 5562272 |
17 | 14232273 |
18 | 36300196 |
19 | 92321085 |
20 | 234192584 |
21 | 592695109 |
22 | 1496810732 |
23 | 3772761289 |
24 | 9492450672 |
25 | 23844342073 |
26 | 59804611060 |
27 | 149787196117 |
[0,1,4,13,40,117,332,921,2512,6761,18004,47525, 124536,324317,840092,2166065,5562272,14232273, 36300196,92321085,234192584,592695109,1496810732, 3772761289,9492450672,23844342073,59804611060, 149787196117] |