Number of tilings of a 5 X 2n rectangle using 2n pentominoes of shapes P, U.

A247121

Number of tilings of a 5 X 2n rectangle using 2n pentominoes of shapes P, U.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =56a(4) =248a(5) =1184a(6) =5472a(7) =25376a(8) =118208a(9) =548864a(10) =2550912a(11) =11856896a(12) =55098368a(13) =256070144a(14) =1190065152a(15) =5530658816a(16) =25703241728a(17) =119453057024a(18) =555145224192

External references