E(n,k), an additive decomposition of the Euler number (triangle read by rows).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =-3a(5) =1a(6) =1a(7) =-7a(8) =6a(9) =0a(10) =1a(11) =-15a(12) =25a(13) =0a(14) =-6a(15) =1a(16) =-31a(17) =90a(18) =0a(19) =-90a(20) =30a(21) =1a(22) =-63a(23) =301a(24) =0a(25) =-840a(26) =630a(27) =-90a(28) =1a(29) =-127