a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026626.
A026962
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026626.
Terms
- a(0) =1a(1) =6a(2) =24a(3) =108a(4) =406a(5) =1572a(6) =5961a(7) =22788a(8) =87209a(9) =335010a(10) =1290376a(11) =4983162a(12) =19286891a(13) =74797176a(14) =290586771a(15) =1130716508a(16) =4406049037a(17) =17191077082a(18) =67152699384a(19) =262594530318
External references
- oeis: A026962