Number of L-connected free polyominoes with n cells (see comments for definition).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =7a(6) =14a(7) =24a(8) =48a(9) =83a(10) =155a(11) =265a(12) =472a(13) =793a(14) =1356a(15) =2235a(16) =3700a(17) =5977a(18) =9636a(19) =15262a(20) =24068a(21) =37439a(22) =57920a(23) =88628a(24) =134838a(25) =203264a(26) =304688a(27) =453126a(28) =670238a(29) =984556