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A014543 Toroidal crossing number of complete graph. 0
0, 0, 0, 0, 0, 0, 0, 4, 9, 23, 42, 70, 105, 154, 226, 326 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

REFERENCES

Gardner, M. Crossing Numbers. Ch. 11 in Knotted Doughnuts and Other Mathematical Entertainments. New York: W. H. Freeman, 1986.

Guy, R. K.; Jenkyns, T.; and Schaer, J. ``Toroidal Crossing Number of Complete Graph.'' J. Comb. Th. 4, 376-390, 1968.

LINKS

Table of n, a(n) for n=1..16.

Eric Weisstein's World of Mathematics, Toroidal Crossing Number.

EXAMPLE

a(7) = 0 and a(8) = 4.

CROSSREFS

Sequence in context: A060250 A138991 A138990 * A131607 A221313 A238832

Adjacent sequences:  A014540 A014541 A014542 * A014544 A014545 A014546

KEYWORD

nonn,nice,more

AUTHOR

Eric W. Weisstein

STATUS

approved

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Last modified December 15 11:43 EST 2019. Contains 329999 sequences. (Running on oeis4.)