Number of monotonic lattice paths of length n which do not pass above the line y = x/(log_2(3)-1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =12a(6) =22a(7) =44a(8) =88a(9) =169a(10) =338a(11) =646a(12) =1292a(13) =2584a(14) =5055a(15) =10110a(16) =20220a(17) =39915a(18) =79830a(19) =157008a(20) =314016a(21) =628032a(22) =1244631a(23) =2489262a(24) =4978524a(25) =9899008a(26) =19798016a(27) =39596032a(28) =78879609a(29) =157759218