Number of 5-cycles in the n X n black bishop graph.

Terms

a(0) =0a(1) =0a(2) =0a(3) =10a(4) =84a(5) =322a(6) =1172a(7) =2780a(8) =7016a(9) =13532a(10) =27720a(11) =47318a(12) =84796a(13) =133294a(14) =217756a(15) =322392a(16) =492240a(17) =696216a(18) =1009680a(19) =1377474a(20) =1918500a(21) =2541946a(22) =3426852a(23) =4431988a(24) =5816888a(25) =7371572a(26) =9460568a(27) =11782862a(28) =14837004a(29) =18204326