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A007872
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Sum of indices of windows of trapezoidal maps.
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0
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1, 1, 1, 4, 9, 27, 89, 304, 944, 3259, 11081, 38044, 132921, 467771, 1650279, 5907280, 21183657, 76488912, 277631065, 1012588940, 3707127319, 13632296219, 50292158921, 186165033296, 691181554768, 2573423459611
(list; graph; refs; listen; history; internal format)
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