A Seidel matrix A(n,k) read by antidiagonals downwards.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =-2a(7) =-1a(8) =1a(9) =4a(10) =-5a(11) =-7a(12) =-8a(13) =-7a(14) =-3a(15) =16a(16) =11a(17) =4a(18) =-4a(19) =-11a(20) =-14a(21) =61a(22) =77a(23) =88a(24) =92a(25) =88a(26) =77a(27) =63a(28) =-272a(29) =-211