Number of 4-cycles in the n X n white bishop graph.

Terms

a(0) =0a(1) =0a(2) =6a(3) =16a(4) =50a(5) =96a(6) =196a(7) =320a(8) =540a(9) =800a(10) =1210a(11) =1680a(12) =2366a(13) =3136a(14) =4200a(15) =5376a(16) =6936a(17) =8640a(18) =10830a(19) =13200a(20) =16170a(21) =19360a(22) =23276a(23) =27456a(24) =32500a(25) =37856a(26) =44226a(27) =50960a(28) =58870a(29) =67200