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A104591
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Number of labeled non-planar non-projective-planar toroidal 2-connected K_{3,3}-subdivision-free graphs with no vertex of degree 2 and with n vertices.
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1
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560, 5040, 957600, 123354000, 16842764400, 2764379217600, 527554510282800, 114387072405606000, 27728561968887780000, 7418031804967840056000, 2167306256125914230527200, 685709965521372865035362400, 233306923207078035272369412000
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OFFSET
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8,1
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COMMENTS
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By empirical evidence, the terms possess a curious prime factor behavior. E.g. 2^5*3^3*5^3*7^2*11*13*17*19 divides a(20)=233306923207078035272369412000.
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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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