Arises in the maximum number of C5's in a triangle-free graph.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =2a(7) =5a(8) =10a(9) =18a(10) =32a(11) =51a(12) =79a(13) =118a(14) =172a(15) =243a(16) =335a(17) =454a(18) =604a(19) =792a(20) =1024a(21) =1306a(22) =1649a(23) =2059a(24) =2548a(25) =3125a(26) =3802a(27) =4591a(28) =5507a(29) =6563