Triangle read by rows, e.g.f. exp(x*(z+1/2))/((exp(3*x/2) + 2*cos(sqrt(3)*x/2))/3).

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =-1a(7) =0a(8) =0a(9) =1a(10) =0a(11) =-4a(12) =0a(13) =0a(14) =1a(15) =0a(16) =0a(17) =-10a(18) =0a(19) =0a(20) =1a(21) =19a(22) =0a(23) =0a(24) =-20a(25) =0a(26) =0a(27) =1a(28) =0a(29) =133