a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A027082.
A027111
a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A027082.
Terms
- a(0) =6a(1) =52a(2) =404a(3) =3237a(4) =26086a(5) =211730a(6) =1730114a(7) =14223429a(8) =117563545a(9) =976408938a(10) =8144436109a(11) =68197885773a(12) =573056586975
External references
- oeis: A027111