Number of L-shaped tiles in all tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

A127866

Number of L-shaped tiles in all tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

Terms

    a(0) =4a(1) =12a(2) =52a(3) =172a(4) =580a(5) =1852a(6) =5828a(7) =17980a(8) =54788a(9) =165116a(10) =493316a(11) =1463036a(12) =4312068a(13) =12641276a(14) =36887556a(15) =107201532a(16) =310427652a(17) =896045052a(18) =2579017732a(19) =7403843580a(20) =21205303300a(21) =60604891132a(22) =172872744964a(23) =492233179132

External references