n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 5 |
4 | 18 |
5 | 141 |
6 | 602 |
7 | 2180 |
8 | 7006 |
9 | 20979 |
10 | 59698 |
11 | 163635 |
12 | 435900 |
13 | 1135036 |
14 | 2901852 |
15 | 7307093 |
16 | 18167506 |
17 | 44683929 |
18 | 108886702 |
19 | 263208036 |
20 | 631773802 |
21 | 1507041943 |
22 | 3575151970 |
23 | 8439694735 |
24 | 19835439712 |
25 | 46433224508 |
26 | 108305733064 |
27 | 251797970649 |
[0,0,5,18,141,602,2180,7006,20979,59698,163635, 435900,1135036,2901852,7307093,18167506,44683929, 108886702,263208036,631773802,1507041943, 3575151970,8439694735,19835439712,46433224508, 108305733064,251797970649] |