n | a(n) |
---|---|
0 | 2 |
1 | 9 |
2 | 40 |
3 | 177 |
4 | 783 |
5 | 3463 |
6 | 15315 |
7 | 67730 |
8 | 299533 |
9 | 1324671 |
10 | 5858296 |
11 | 25908042 |
12 | 114577112 |
13 | 506711954 |
14 | 2240910072 |
15 | 9910320668 |
16 | 43827932664 |
17 | 193826995709 |
18 | 857190882207 |
19 | 3790886846546 |
20 | 16765020932461 |
21 | 74142526074589 |
22 | 327891876477017 |
23 | 1450086587978657 |
[2,9,40,177,783,3463,15315,67730,299533,1324671, 5858296,25908042,114577112,506711954,2240910072, 9910320668,43827932664,193826995709,857190882207, 3790886846546,16765020932461,74142526074589, 327891876477017,1450086587978657] |