Number of chordless cycles in the n-Moebius ladder.

Terms

a(0) =1a(1) =6a(2) =9a(3) =12a(4) =15a(5) =22a(6) =35a(7) =56a(8) =87a(9) =134a(10) =209a(11) =332a(12) =533a(13) =858a(14) =1381a(15) =2224a(16) =3587a(17) =5794a(18) =9367a(19) =15148a(20) =24499a(21) =39626a(22) =64101a(23) =103704a(24) =167785a(25) =271470a(26) =439233a(27) =710676a(28) =1149879a(29) =1860526