|
| |
|
|
A240446
|
|
Numbers of ways to place six indistinguishable points on an n X n square grid so that no four of them are vertices of a square of any orientation.
|
|
2
|
|
|
|
32, 6726, 166702, 1895938, 13790212, 74380406, 322961410, 1188292304, 3835115230, 11126671552, 29549197210, 72828900336, 168386628278, 368360769558, 767733010896, 1533170797506, 2947620125778, 5477517677094, 9871827636572, 17305042166112, 29579923394356, 49410229230976, 80809088567212, 129615220384928, 204196987161028, 316383511891814, 482682961875178, 725860819178050
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
3,1
|
|
|
LINKS
|
|
|
|
FORMULA
|
a(n) = (n^12 - 15*n^10 + 55*n^8 + 75*n^6)/720 + O(n^4).
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
EXTENSIONS
|
|
|
|
STATUS
|
approved
|
| |
|
|
