Slice of elementary triangular automaton rule 58, starting from a lone 1 cell.

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =31a(5) =48a(6) =104a(7) =220a(8) =484a(9) =796a(10) =1700a(11) =3580a(12) =7940a(13) =12588a(14) =27516a(15) =57284a(16) =122956a(17) =201036a(18) =439756a(19) =909068a(20) =2048428a(21) =3260604a(22) =6950308a(23) =14619132a(24) =31505156a(25) =51481228a(26) =112237244a(27) =232238020a(28) =525920332a(29) =837265868