INVERT transform of A027656: (1, 0, 2, 0, 3, 0, 4, 0, 5, ...).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =19a(6) =36a(7) =69a(8) =131a(9) =250a(10) =476a(11) =907a(12) =1728a(13) =3292a(14) =6272a(15) =11949a(16) =22765a(17) =43371a(18) =82629a(19) =157422a(20) =299915a(21) =571388a(22) =1088589a(23) =2073943a(24) =3951206a(25) =7527704a(26) =14341527a(27) =27322992a(28) =52054840a(29) =99173120