a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026659.
A026978
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026659.
Terms
- a(0) =1a(1) =8a(2) =41a(3) =208a(4) =856a(5) =4540a(6) =18527a(7) =86896a(8) =343976a(9) =1794146a(10) =7114521a(11) =33019048a(12) =129946039a(13) =674164700a(14) =2656947487a(15) =12352433072a(16) =48571744683a(17) =251186392774a(18) =988685996629
External references
- oeis: A026978