Number of tilings of a 10 X n rectangle using 2n pentominoes of shape I.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =8a(6) =17a(7) =28a(8) =41a(9) =56a(10) =144a(11) =317a(12) =609a(13) =1060a(14) =1716a(15) =3324a(16) =6713a(17) =13188a(18) =24624a(19) =43620a(20) =80464a(21) =153645a(22) =296025a(23) =562097a(24) =1037921a(25) =1920661a(26) =3600832a(27) =6820873a(28) =12920804a(29) =24211457