n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 18 |
4 | 116 |
5 | 660 |
6 | 3542 |
7 | 18438 |
8 | 94376 |
9 | 478440 |
10 | 2411882 |
11 | 12118458 |
12 | 60769436 |
13 | 304378620 |
14 | 1523487422 |
15 | 7622220078 |
16 | 38125449296 |
17 | 190670293200 |
18 | 953480606162 |
19 | 4767790451298 |
20 | 23840114517956 |
21 | 119204059374180 |
22 | 596030757224102 |
23 | 2980185167180118 |
24 | 14901019979079416 |
[0,0,2,18,116,660,3542,18438,94376,478440,2411882, 12118458,60769436,304378620,1523487422,7622220078, 38125449296,190670293200,953480606162, 4767790451298,23840114517956,119204059374180, 596030757224102,2980185167180118, 14901019979079416] |