Harary index of the n X n queen graph.

Terms

a(0) =0a(1) =6a(2) =32a(3) =98a(4) =230a(5) =460a(6) =826a(7) =1372a(8) =2148a(9) =3210a(10) =4620a(11) =6446a(12) =8762a(13) =11648a(14) =15190a(15) =19480a(16) =24616a(17) =30702a(18) =37848a(19) =46170a(20) =55790a(21) =66836a(22) =79442a(23) =93748a(24) =109900a(25) =128050a(26) =148356a(27) =170982a(28) =196098a(29) =223880