Triangle, read by rows, T(n, k) = p(n)/(p(k)*p(n-k)), where p(n) = Product_{j=1..n} A001607(j).

Terms

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