G.f. = continued fraction: A(x)=1/(1-x/(1-2*x^2/(1-3*x^3/(1-4*x^4/(...))))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =11a(6) =27a(7) =55a(8) =127a(9) =285a(10) =647a(11) =1457a(12) =3297a(13) =7489a(14) =16945a(15) =38523a(16) =87293a(17) =198179a(18) =449907a(19) =1021135a(20) =2318527a(21) =5263581a(22) =11950967a(23) =27133985a(24) =61609953a(25) =139888777a(26) =317629465a(27) =721215027a(28) =1637598485a(29) =3718378619