Number of chordless cycles of length >= 4 in the n-flower graph.

Terms

a(0) =3a(1) =23a(2) =63a(3) =127a(4) =273a(5) =583a(6) =1287a(7) =2975a(8) =6993a(9) =16535a(10) =39525a(11) =95071a(12) =229029a(13) =552199a(14) =1332375a(15) =3215807a(16) =7762611a(17) =18739607a(18) =45240309a(19) =109217983a(20) =263673699a(21) =636563527a(22) =1536798717a(23) =3710157407a(24) =8957109801a(25) =21624374039a(26) =52205854257a(27) =126036078751a(28) =304278008331a(29) =734592089095