n | a(n) |
---|---|
4 | 1 |
5 | 1 |
6 | 2 |
7 | 3 |
8 | 9 |
9 | 18 |
10 | 62 |
11 | 198 |
12 | 803 |
13 | 3378 |
14 | 15882 |
15 | 77185 |
16 | 393075 |
17 | 2049974 |
18 | 10938182 |
19 | 59312272 |
20 | 326258544 |
21 | 1815910231 |
22 | 10213424233 |
23 | 57974895671 |
24 | 331820721234 |
25 | 1913429250439 |
26 | 11109119321058 |
27 | 64901418126997 |
[1,1,2,3,9,18,62,198,803,3378,15882,77185,393075, 2049974,10938182,59312272,326258544,1815910231, 10213424233,57974895671,331820721234, 1913429250439,11109119321058,64901418126997] |