a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026552.
A027274
a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026552.
Terms
- a(0) =10a(1) =40a(2) =342a(3) =1279a(4) =11016a(5) =41462a(6) =359530a(7) =1365014a(8) =11899516a(9) =45501743a(10) =398306769a(11) =1531614109a(12) =13450930624a(13) =51952990090a(14) =457449811458
External references
- oeis: A027274