Unreduced numerators in triangle that leads to the Euler numbers A198631(n)/A006519(n+1).

Terms

a(0) =1a(1) =1a(2) =1a(3) =-2a(4) =1a(5) =-3a(6) =1a(7) =-4a(8) =2a(9) =1a(10) =-5a(11) =5a(12) =1a(13) =-6a(14) =9a(15) =-10a(16) =1a(17) =-7a(18) =14a(19) =-35a(20) =1a(21) =-8a(22) =20a(23) =-80a(24) =26a(25) =1a(26) =-9a(27) =27a(28) =-150a(29) =117