Number of ways to tile a 3-row parallelogram of length n with triangular and rectangular tiles, each of size 3.

A375821

Number of ways to tile a 3-row parallelogram of length n with triangular and rectangular tiles, each of size 3.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =7a(4) =17a(5) =41a(6) =107a(7) =274a(8) =693a(9) =1766a(10) =4504a(11) =11465a(12) =29194a(13) =74364a(14) =189391a(15) =482327a(16) =1228412a(17) =3128559a(18) =7967841a(19) =20292639a(20) =51681711a(21) =131623900a(22) =335222103a(23) =853749852a(24) =2174345752a(25) =5537663377a(26) =14103422348a(27) =35918853952a(28) =91478793557a(29) =232979863277

External references