Number of 1-sided strip polyominoes with n cells.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =10a(5) =24a(6) =52a(7) =124a(8) =282a(9) =668a(10) =1548a(11) =3654a(12) =8533a(13) =20093a(14) =47033a(15) =110533a(16) =258807a(17) =607227a(18) =1421055a(19) =3329585a(20) =7785995a(21) =18221563a(22) =42575336a(23) =99539106a(24) =232398659a(25) =542864111a(26) =1266567155a(27) =2956342341a(28) =6893180336a(29) =16078817198