Numerator of 1/49 - 1/n^2.

Terms

a(0) =0a(1) =15a(2) =32a(3) =51a(4) =72a(5) =95a(6) =120a(7) =3a(8) =176a(9) =207a(10) =240a(11) =275a(12) =312a(13) =351a(14) =8a(15) =435a(16) =480a(17) =527a(18) =576a(19) =627a(20) =680a(21) =15a(22) =792a(23) =851a(24) =912a(25) =975a(26) =1040a(27) =1107a(28) =24a(29) =1247