Number of integer-sided triangles with sides a,b,c, a<b<c, a+b+c=n such that c - b = b - a.

Terms

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