a(n) = Sum_{k=0..m} T(n,k) * T(n,k+1), where m=0 for n=1; m=n for n >= 2; and T is given by A026120.
A027323
a(n) = Sum_{k=0..m} T(n,k) * T(n,k+1), where m=0 for n=1; m=n for n >= 2; and T is given by A026120.
Terms
- a(0) =1a(1) =5a(2) =38a(3) =281a(4) =2116a(5) =16222a(6) =126244a(7) =994860a(8) =7923456a(9) =63679869a(10) =515810606a(11) =4206733157a(12) =34515110876a(13) =284699216035
External references
- oeis: A027323