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A136290
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Continuing from the arrangement of pennies described in A136289, we also wish to place dimes over the holes in the array, where the n-th generation of dimes can be placed only when all three of its supporting pennies are in place already; sequence gives number of dimes in generation n.
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1
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1, 3, 9, 12, 15, 21, 24, 27, 33, 36, 39, 45, 48
(list; graph; refs; listen; history; internal format)
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