n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 18 |
5 | 39 |
6 | 95 |
7 | 232 |
8 | 606 |
9 | 1663 |
10 | 4839 |
11 | 14807 |
12 | 47330 |
13 | 156611 |
14 | 532308 |
15 | 1846622 |
16 | 6507103 |
17 | 23210020 |
18 | 83590477 |
19 | 303425693 |
20 | 1108650850 |
21 | 4073443378 |
22 | 15039391464 |
23 | 55763147423 |
24 | 207543422052 |
25 | 775082175863 |
26 | 2903508757053 |
27 | 10907257755616 |
[1,1,4,7,18,39,95,232,606,1663,4839,14807,47330, 156611,532308,1846622,6507103,23210020,83590477, 303425693,1108650850,4073443378,15039391464, 55763147423,207543422052,775082175863, 2903508757053,10907257755616] |