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Search: id:A137237
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| A137237 |
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Number of non-isomorphic drawings of K_n with minimum crossings. |
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+0
1
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OFFSET
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1,7
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COMMENT
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Entry for n=9 stated to be "about 200" in reference.
The paper does not actually show the five drawings of K_7, the three drawings of K_8, or the "about 200" drawings of K_9. Nor does it explain how these numbers were arrived at, or prove that there is only one drawing for K<7.
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LINKS
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P. Erdos and R. K. Guy, Crossing Number Problems The American Mathematical Monthly, Vol. 80, No. 1. (Jan., 1973), pp. 52-58.
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CROSSREFS
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Adjacent sequences: A137234 A137235 A137236 this_sequence A137238 A137239 A137240
Sequence in context: A068566 A046270 A139207 this_sequence A152419 A077602 A144481
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KEYWORD
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hard,more,nonn
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AUTHOR
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Jonathan Schneider (jschne9(AT)uic.edu), Mar 08 2008
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