Triangle of diagonals of symmetric Krawtchouk matrices.

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =0a(5) =1a(6) =1a(7) =3a(8) =-3a(9) =-1a(10) =1a(11) =8a(12) =-12a(13) =8a(14) =1a(15) =1a(16) =15a(17) =-20a(18) =20a(19) =-15a(20) =-1a(21) =1a(22) =24a(23) =-15a(24) =0a(25) =-15a(26) =24a(27) =1a(28) =1a(29) =35