n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 14 |
4 | 50 |
5 | 181 |
6 | 657 |
7 | 2385 |
8 | 8657 |
9 | 31422 |
10 | 114051 |
11 | 413966 |
12 | 1502555 |
13 | 5453761 |
14 | 19795288 |
15 | 71850128 |
16 | 260791401 |
17 | 946583628 |
18 | 3435774958 |
19 | 12470688498 |
20 | 45264335853 |
21 | 164294064481 |
22 | 596331286321 |
23 | 2164478699633 |
24 | 7856317702310 |
25 | 28515747394555 |
26 | 103502414271126 |
[1,4,14,50,181,657,2385,8657,31422,114051,413966, 1502555,5453761,19795288,71850128,260791401, 946583628,3435774958,12470688498,45264335853, 164294064481,596331286321,2164478699633, 7856317702310,28515747394555,103502414271126] |