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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =3a(8) =3a(9) =1a(10) =-1a(11) =4a(12) =6a(13) =4a(14) =1a(15) =-4a(16) =-5a(17) =10a(18) =10a(19) =5a(20) =1a(21) =-14a(22) =-24a(23) =-15a(24) =20a(25) =15a(26) =6a(27) =1a(28) =-34a(29) =-98