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A084481
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Number of fault-free tilings of (4 X 2n) rectangle with L tetromino.
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4
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2, 6, 10, 18, 38, 84, 186, 410, 904, 1994, 4398, 9700, 21394, 47186, 104072, 229538, 506262, 1116596, 2462730, 5431722, 11980040, 26422810, 58277342, 128534724, 283492258, 625261858, 1379058440, 3041609138, 6708480134
(list; graph; refs; listen; history; internal format)
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