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A034185
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Number of symmetric n x 3 crossword puzzle grids.
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0
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1, 3, 11, 21, 61, 111, 309, 565, 1563, 2859, 7907, 14459, 39991, 73117, 202227, 369729, 1022587, 1869581, 5170829, 9453757, 26146909, 47804041
(list; graph; refs; listen; history; internal format)
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