E.g.f. C(x,y) = cos(y) / sqrt(1 - sin(x)^2 - sin(y)^2).

Terms

a(0) =1a(1) =1a(2) =0a(3) =5a(4) =2a(5) =0a(6) =61a(7) =28a(8) =16a(9) =0a(10) =1385a(11) =662a(12) =440a(13) =272a(14) =0a(15) =50521a(16) =24568a(17) =17176a(18) =12448a(19) =7936a(20) =0a(21) =2702765a(22) =1326122a(23) =949520a(24) =727232a(25) =546560a(26) =353792a(27) =0a(28) =199360981a(29) =98329108