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A104593
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Number of labeled planar 2-connected graphs with no vertex of degree 2 and with n vertices.
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3
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1, 25, 1317, 96012, 8976600, 1027205280, 139315157730, 21864486188160, 3898841480307900, 778680435365714700, 172192746831203449890, 41765231538761743574100, 11024455369912310561835600
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OFFSET
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4,2
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COMMENTS
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By empirical evidence, the terms possess a curious prime factor behavior. E.g. 2^4*3^4*5^2*7*11*13^2 divides a(16)=11024455369912310561835600.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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