Number of tilings of a 30 X n rectangle using 3n decominoes of shape I.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =89a(11) =225a(12) =415a(13) =665a(14) =981a(15) =1369a(16) =1835a(17) =2385a(18) =3025a(19) =3761a(20) =30169a(21) =79903a(22) =167957a(23) =314911a(24) =548011a(25) =902339a(26) =1422073a(27) =2161837a(28) =3188141a(29) =4580911