INVERT transform of A028310.

Terms

a(0) =1a(1) =2a(2) =5a(3) =12a(4) =28a(5) =65a(6) =151a(7) =351a(8) =816a(9) =1897a(10) =4410a(11) =10252a(12) =23833a(13) =55405a(14) =128801a(15) =299426a(16) =696081a(17) =1618192a(18) =3761840a(19) =8745217a(20) =20330163a(21) =47261895a(22) =109870576a(23) =255418101a(24) =593775046a(25) =1380359512a(26) =3208946545a(27) =7459895657a(28) =17342153393a(29) =40315615410