Central coefficients in Product_{k=1..n} (1 + k*y + y^2).

A201826

Central coefficients in Product_{k=1..n} (1 + k*y + y^2).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =18a(4) =100a(5) =660a(6) =5038a(7) =43624a(8) =422252a(9) =4516380a(10) =52885644a(11) =672781824a(12) =9238314358a(13) =136175455234

External references