n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 19 |
4 | 69 |
5 | 258 |
6 | 1009 |
7 | 4051 |
8 | 16620 |
9 | 69339 |
10 | 293485 |
11 | 1255837 |
12 | 5427580 |
13 | 23650266 |
14 | 103780197 |
15 | 458260421 |
16 | 2034519989 |
17 | 9075959960 |
18 | 40663040317 |
19 | 182882049074 |
20 | 825372922736 |
21 | 3736795149850 |
22 | 16966383950246 |
23 | 77235724826460 |
24 | 352445379796634 |
25 | 1611854862549043 |
26 | 7386683542925906 |
27 | 33915357128568520 |
[1,2,6,19,69,258,1009,4051,16620,69339,293485, 1255837,5427580,23650266,103780197,458260421, 2034519989,9075959960,40663040317,182882049074, 825372922736,3736795149850,16966383950246, 77235724826460,352445379796634,1611854862549043, 7386683542925906,33915357128568520] |