Number of compositions of n with cuts-resistance 2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =3a(5) =6a(6) =9a(7) =22a(8) =47a(9) =88a(10) =179a(11) =354a(12) =691a(13) =1344a(14) =2617a(15) =5042a(16) =9709a(17) =18632a(18) =35639a(19) =68010a(20) =129556a(21) =246202a(22) =467188a(23) =885036a(24) =1674211a(25) =3163094a(26) =5969022a(27) =11251676a(28) =21189382a(29) =39867970