a(n) = Sum_{k=0..2*n-3} T(n, k)*T(n, k+3), T given by A027960.
A027987
a(n) = Sum_{k=0..2*n-3} T(n, k)*T(n, k+3), T given by A027960.
Terms
- a(0) =58a(1) =272a(2) =1154a(3) =4757a(4) =19378a(5) =78422a(6) =315994a(7) =1269270a(8) =5086294a(9) =20345092a(10) =81265106a(11) =324240331a(12) =1292556986a(13) =5149091916a(14) =20500830986a(15) =81586994576a(16) =324577199086
External references
- oeis: A027987