Euler-Seidel matrix T(k,n) with start sequence e.g.f. 2x/(1+e^(2x)), read by antidiagonals.

Terms

a(0) =0a(1) =1a(2) =1a(3) =0a(4) =-1a(5) =-2a(6) =-3a(7) =-3a(8) =-2a(9) =0a(10) =0a(11) =3a(12) =6a(13) =8a(14) =8a(15) =25a(16) =25a(17) =22a(18) =16a(19) =8a(20) =0a(21) =0a(22) =-25a(23) =-50a(24) =-72a(25) =-88a(26) =-96a(27) =-96a(28) =-427a(29) =-427