Sixth degree product sequence: a(n) = product( 1 +4*cos(k*Pi/n)^2 +16*cos(k*Pi/n)^4 +64*cos(k*Pi/n)^6, k=1..(n-1)/2 ).

A152116

Sixth degree product sequence: a(n) = product( 1 +4*cos(k*Pi/n)^2 +16*cos(k*Pi/n)^4 +64*cos(k*Pi/n)^6, k=1..(n-1)/2 ).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =15a(5) =45a(6) =160a(7) =533a(8) =1785a(9) =6052a(10) =20295a(11) =68441a(12) =230400a(13) =775657a(14) =2612233a(15) =8794980a(16) =29614935a(17) =99718277a(18) =335764960a(19) =1130580029a(20) =3806834625a(21) =12818225732a(22) =43161016271a(23) =145329992177a(24) =489349324800

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