Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = 4^(2*(n-1)*(k-1)) * Product_{a=1..n-1} Product_{b=1..k-1} (1 - sin(a*Pi/(2*n))^2 * sin(b*Pi/(2*k))^2).

A340427

Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = 4^(2*(n-1)*(k-1)) * Product_{a=1..n-1} Product_{b=1..k-1} (1 - sin(a*Pi/(2*n))^2 * sin(b*Pi/(2*k))^2).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =12a(5) =1a(6) =1a(7) =140a(8) =140a(9) =1a(10) =1a(11) =1632a(12) =17745a(13) =1632a(14) =1a(15) =1a(16) =19024a(17) =2227120a(18) =2227120a(19) =19024a(20) =1a(21) =1a(22) =221760a(23) =279215849a(24) =2958176256a(25) =279215849a(26) =221760a(27) =1a(28) =1a(29) =2585024

External references