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A046752
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Triangle of number of homeomorphically irreducible stars with n edges and m nodes.
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1
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1, 1, 1, 1, 1, 2, 2, 1, 3, 5, 1, 4, 13, 4, 1, 6, 26, 24, 5, 1, 7, 47, 84, 38, 1, 9, 78, 233, 216, 23, 1, 11, 126, 557, 914, 314, 16
(list; graph; refs; listen; history; internal format)
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