

A137237


Number of nonisomorphic drawings of K_n with minimum crossings.


0




OFFSET

1,7


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.


LINKS

Table of n, a(n) for n=1..8.
P. Erdos and R. K. Guy, Crossing Number Problems The American Mathematical Monthly, Vol. 80, No. 1. (1973), pp. 5258.


CROSSREFS

Sequence in context: A212481 A046270 A139207 * A152419 A322758 A077602
Adjacent sequences: A137234 A137235 A137236 * A137238 A137239 A137240


KEYWORD

hard,more,nonn


AUTHOR

Jonathan Schneider (jschne9(AT)uic.edu), Mar 08 2008


STATUS

approved



