Quartic product sequence: m = 4; p = 4^3; a(n) = Product_{k=1..(n-1)/2} ( 1 + m*cos(k*Pi/n)^2 + p*cos(k*Pi/n)^4 ).
A152098
Quartic product sequence: m = 4; p = 4^3; a(n) = Product_{k=1..(n-1)/2} ( 1 + m*cos(k*Pi/n)^2 + p*cos(k*Pi/n)^4 ).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =6a(4) =19a(5) =61a(6) =240a(7) =769a(8) =2869a(9) =9774a(10) =34831a(11) =121969a(12) =428640a(13) =1509301a(14) =5297641a(15) =18644406a(16) =65502139a(17) =230343541a(18) =809678160a(19) =2846468089a(20) =10006911469a(21) =35178340254a(22) =123671565271a(23) =434760784009
External references
- oeis: A152098