Quartic product sequence: a(n) = 2^n*Product_{k=1..(n-1)/2} (1 + m*cos(k*Pi/n)^2 + q*cos(k*Pi/n)^4), with m=6, q=4.
A152104
Quartic product sequence: a(n) = 2^n*Product_{k=1..(n-1)/2} (1 + m*cos(k*Pi/n)^2 + q*cos(k*Pi/n)^4), with m=6, q=4.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =22a(4) =80a(5) =342a(6) =1364a(7) =5602a(8) =22720a(9) =92642a(10) =376884a(11) =1534742a(12) =6247120a(13) =25433302a(14) =103536164a(15) =421498242a(16) =1715905280a(17) =6985435522a(18) =28437573604a(19) =115768943702a(20) =471293442000
External references
- oeis: A152104