Harary index of the n X n black bishop graph.

Terms

a(0) =0a(1) =1a(2) =8a(3) =21a(4) =55a(5) =104a(6) =197a(7) =318a(8) =514a(9) =755a(10) =1110a(11) =1531a(12) =2113a(13) =2786a(14) =3675a(15) =4684a(16) =5972a(17) =7413a(18) =9204a(19) =11185a(20) =13595a(21) =16236a(22) =19393a(23) =22826a(24) =26870a(25) =31239a(26) =36322a(27) =41783a(28) =48069a(29) =54790