Detour index of the n X n black bishop graph.

Terms

a(0) =0a(1) =1a(2) =40a(3) =196a(4) =936a(5) =2601a(6) =7200a(7) =15376a(8) =32800a(9) =60025a(10) =109800a(11) =181476a(12) =299880a(13) =461041a(14) =708736a(15) =1032256a(16) =1503360a(17) =2099601a(18) =2932200a(19) =3960100a(20) =5348200a(21) =7027801a(22) =9234720a(23) =11861136a(24) =15234336a(25) =19193161a(26) =24180520a(27) =29964676a(28) =37132200a(29) =45360225