The infinite Seidel matrix H read by antidiagonals upwards; H = (H(n,k): n,k >= 0).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =-1a(5) =0a(6) =0a(7) =1a(8) =2a(9) =2a(10) =5a(11) =5a(12) =4a(13) =2a(14) =0a(15) =0a(16) =-5a(17) =-10a(18) =-14a(19) =-16a(20) =-16a(21) =-61a(22) =-61a(23) =-56a(24) =-46a(25) =-32a(26) =-16a(27) =0a(28) =0a(29) =61