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A007822
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Number of symmetric foldings of 2n+1 stamps.
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1
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1, 3, 9, 28, 89, 287, 935, 3072, 10157, 33767, 112736, 377836, 1270203, 4282311, 14470629, 49005732, 166261653, 565055147, 1923186472, 6554868916
(list; graph; refs; listen; history; internal format)
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