Number of tatami tilings of a 7 X n grid (with monomers allowed).

Terms

a(0) =1a(1) =21a(2) =357a(3) =406a(4) =490a(5) =584a(6) =827a(7) =1090a(8) =1914a(9) =3262a(10) =6228a(11) =10226a(12) =17114a(13) =25534a(14) =41034a(15) =61778a(16) =102644a(17) =163334a(18) =278554a(19) =446898a(20) =747274a(21) =1175494a(22) =1926612a(23) =3021594a(24) =4960170a(25) =7880334a(26) =13028058a(27) =20841466a(28) =34355316a(29) =54835150