Expansion of g.f.: Product_{n>0} 1/(1 - 2^(n-1)*x^n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =19a(5) =43a(6) =115a(7) =259a(8) =659a(9) =1523a(10) =3731a(11) =8531a(12) =20883a(13) =47379a(14) =113043a(15) =259219a(16) =609683a(17) =1385363a(18) =3245459a(19) =7344531a(20) =17028499a(21) =38579603a(22) =88585619a(23) =199845267a(24) =457864595a(25) =1028904339a(26) =2339763603a(27) =5256820115a(28) =11896157587a(29) =26626389395