The number of tilings of a 7 X (4n) floor with 1 X 4 tetrominoes.

A236581

The number of tilings of a 7 X (4n) floor with 1 X 4 tetrominoes.

Terms

    a(0) =1a(1) =5a(2) =37a(3) =269a(4) =1949a(5) =14121a(6) =102313a(7) =741305a(8) =5371097a(9) =38916077a(10) =281964941a(11) =2042966149a(12) =14802232757a(13) =107249008849a(14) =777068573905

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