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A131890
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a(n) is the number of shapes of balanced trees with constant branching factor 4 and n nodes. The node is balanced if the size, measured in nodes, of each pair of its children differ by at most one node.
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4
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1, 4, 6, 4, 1, 16, 96, 256, 256, 1536, 3456, 3456, 1296, 3456, 3456, 1536, 256, 256, 96, 16, 1, 64, 1536, 16384, 65536, 1572864, 14155776, 56623104, 84934656, 905969664, 3623878656, 6442450944, 4294967296, 17179869184, 25769803776, 17179869184
(list; graph; refs; listen; history; internal format)
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