a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A008288.
A026935
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A008288.
Terms
- a(0) =1a(1) =10a(2) =75a(3) =500a(4) =3149a(5) =19214a(6) =115031a(7) =680424a(8) =3992921a(9) =23305234a(10) =135514019a(11) =785892316a(12) =4549048229a(13) =26295995926a(14) =151857925039a(15) =876366840784
External references
- oeis: A026935