n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 13 |
3 | 37 |
4 | 99 |
5 | 254 |
6 | 636 |
7 | 1567 |
8 | 3822 |
9 | 9261 |
10 | 22346 |
11 | 53773 |
12 | 129174 |
13 | 309958 |
14 | 743228 |
15 | 1781330 |
16 | 4268166 |
17 | 10224885 |
18 | 24492034 |
19 | 58662298 |
20 | 140498877 |
21 | 336491169 |
22 | 805872377 |
23 | 1929983778 |
24 | 4622083068 |
25 | 11069289411 |
26 | 26509431448 |
27 | 63486333364 |
[1,4,13,37,99,254,636,1567,3822,9261,22346,53773, 129174,309958,743228,1781330,4268166,10224885, 24492034,58662298,140498877,336491169,805872377, 1929983778,4622083068,11069289411,26509431448, 63486333364] |