a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026615.
A026959
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026615.
Terms
- a(0) =1a(1) =14a(2) =115a(3) =640a(4) =3049a(5) =13494a(6) =57491a(7) =239768a(8) =986976a(9) =4027666a(10) =16335660a(11) =65955960a(12) =265386251a(13) =1064993622a(14) =4264898875a(15) =17051078256a(16) =68080259516a(17) =271537515786
External references
- oeis: A026959