Triangle a(n,k) (1<=k<=n) of "signed Eulerian numbers" read by rows.

Terms

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