The number of tilings of a 6 X (4n) floor with 1 X 4 tetrominoes.

A236580

The number of tilings of a 6 X (4n) floor with 1 X 4 tetrominoes.

Terms

    a(0) =1a(1) =4a(2) =25a(3) =154a(4) =943a(5) =5773a(6) =35344a(7) =216388a(8) =1324801a(9) =8110882a(10) =49657576a(11) =304020556a(12) =1861317163a(13) =11395616227a(14) =69767835259a(15) =427142397547

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