|
Search: id:A137237
|
|
|
| A137237 |
|
Number of non-isomorphic drawings of K_n with minimum crossings. |
|
+0
1
|
| |
|
|
OFFSET
|
1,7
|
|
|
COMMENT
|
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
|
P. Erdos and R. K. Guy, Crossing Number Problems The American Mathematical Monthly, Vol. 80, No. 1. (1973), pp. 52-58.
|
|
CROSSREFS
|
Sequence in context: A068566 A046270 A139207 this_sequence A152419 A077602 A144481
Adjacent sequences: A137234 A137235 A137236 this_sequence A137238 A137239 A137240
|
|
KEYWORD
|
hard,more,nonn
|
|
AUTHOR
|
Jonathan Schneider (jschne9(AT)uic.edu), Mar 08 2008
|
|
|
Search completed in 0.002 seconds
|
