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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
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OFFSET
| 1,7
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COMMENTS
| 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
| P. Erdos and R. K. Guy, Crossing Number Problems The American Mathematical Monthly, Vol. 80, No. 1. (1973), pp. 52-58.
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CROSSREFS
| Sequence in context: A068566 A046270 A139207 * A152419 A077602 A193547
Adjacent sequences: A137234 A137235 A137236 * A137238 A137239 A137240
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KEYWORD
| hard,more,nonn
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AUTHOR
| Jonathan Schneider (jschne9(AT)uic.edu), Mar 08 2008
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