Let P(k,X) = Product_{i=1..2*k} (X-1/cos(Pi*(2*i-1)/(4*k)) ) which is a polynomial with integer coefficients. Sequence gives array of coefficients for P(k,X).

A075615

Let P(k,X) = Product_{i=1..2*k} (X-1/cos(Pi*(2*i-1)/(4*k)) ) which is a polynomial with integer coefficients. Sequence gives array of coefficients for P(k,X).

Terms

    a(0) =1a(1) =0a(2) =-2a(3) =1a(4) =0a(5) =-8a(6) =0a(7) =8a(8) =1a(9) =0a(10) =-18a(11) =0a(12) =48a(13) =0a(14) =-32a(15) =1a(16) =0a(17) =-32a(18) =0a(19) =160a(20) =0a(21) =-256a(22) =0a(23) =128a(24) =1a(25) =0a(26) =-50a(27) =0a(28) =400a(29) =0

External references