INVERTi transform of A000081 = [1, 2, 4, 9, 20, 48, 115, 286, 719, 1842, 4766, 12486,...].

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =8a(6) =16a(7) =41a(8) =98a(9) =250a(10) =631a(11) =1646a(12) =4285a(13) =11338a(14) =30135a(15) =80791a(16) =217673a(17) =590010a(18) =1606188a(19) =4392219a(20) =12055393a(21) =33206321a(22) =91752211a(23) =254261363a(24) =706465999a(25) =1967743066a(26) =5493195530a(27) =15367129299a(28) =43073007846a(29) =120949992543