n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 8 |
4 | 22 |
5 | 52 |
6 | 142 |
7 | 362 |
8 | 973 |
9 | 2574 |
10 | 6935 |
11 | 18643 |
12 | 50573 |
13 | 137401 |
14 | 375306 |
15 | 1027898 |
16 | 2825831 |
17 | 7790055 |
18 | 21539352 |
19 | 59706865 |
20 | 165921896 |
21 | 462127857 |
22 | 1289901083 |
23 | 3607567539 |
24 | 10108555623 |
25 | 28374358327 |
26 | 79777757405 |
27 | 224653284863 |
[1,1,4,8,22,52,142,362,973,2574,6935,18643,50573, 137401,375306,1027898,2825831,7790055,21539352, 59706865,165921896,462127857,1289901083, 3607567539,10108555623,28374358327,79777757405, 224653284863] |