a(1) =a(2) =1. a(n+1) = (sum{1<=k<=n/2} a(k)) * (sum{n/2<j<=n} a(j)).
A113844
a(1) =a(2) =1. a(n+1) = (sum{1<=k<=n/2} a(k)) * (sum{n/2<j<=n} a(j)).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =18a(6) =78a(7) =312a(8) =2070a(9) =12420a(10) =163878a(11) =1966536a(12) =62213526a(13) =1866405780a(14) =206591803854
External references
- oeis: A113844