n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 26 |
5 | 69 |
6 | 181 |
7 | 476 |
8 | 1252 |
9 | 3292 |
10 | 8657 |
11 | 22765 |
12 | 59864 |
13 | 157422 |
14 | 413966 |
15 | 1088589 |
16 | 2862617 |
17 | 7527704 |
18 | 19795288 |
19 | 52054840 |
20 | 136886433 |
21 | 359964521 |
22 | 946583628 |
23 | 2489191330 |
24 | 6545722210 |
25 | 17213011605 |
26 | 45264335853 |
27 | 119029728628 |
[1,1,4,10,26,69,181,476,1252,3292,8657,22765, 59864,157422,413966,1088589,2862617,7527704, 19795288,52054840,136886433,359964521,946583628, 2489191330,6545722210,17213011605,45264335853, 119029728628] |