n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 8 |
4 | 57 |
5 | 256 |
6 | 1153 |
7 | 4181 |
8 | 14180 |
9 | 47381 |
10 | 115267 |
11 | 307214 |
12 | 737909 |
13 | 1682367 |
14 | 3850940 |
15 | 8557010 |
16 | 18311575 |
17 | 37925058 |
18 | 61662056 |
[0,1,8,57,256,1153,4181,14180,47381,115267,307214, 737909,1682367,3850940,8557010,18311575,37925058, 61662056] |