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A186507
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Number of base-3 pyramids of height n.
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1
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2, 2, 2, 6, 10, 14, 30, 47, 62, 91, 134, 217, 316, 483, 743, 1118, 1598, 2422, 3616, 5316, 8061, 12284, 18675, 26946, 39146, 59339, 90790, 137602, 206390, 316184
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