n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 45 |
5 | 171 |
6 | 689 |
7 | 2756 |
8 | 11351 |
9 | 47976 |
10 | 204381 |
11 | 878826 |
12 | 3824025 |
13 | 16776688 |
14 | 74021638 |
15 | 328681019 |
16 | 1467532698 |
17 | 6581442360 |
18 | 29637099404 |
19 | 133969162219 |
20 | 607582367783 |
21 | 2763746150889 |
22 | 12606655549991 |
23 | 57648997909311 |
24 | 264223264007648 |
25 | 1213578131312042 |
26 | 5584897636305793 |
27 | 25748047536912449 |
[1,1,4,13,45,171,689,2756,11351,47976,204381, 878826,3824025,16776688,74021638,328681019, 1467532698,6581442360,29637099404,133969162219, 607582367783,2763746150889,12606655549991, 57648997909311,264223264007648,1213578131312042, 5584897636305793,25748047536912449] |