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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..14.

FORMULA

a(n) = (n^12 - 15*n^10 + 55*n^8 + 75*n^6)/720 + O(n^4).

CROSSREFS

Cf. A240444, A240445.

Sequence in context: A232913 A209542 A028461 * A221608 A283922 A224100

Adjacent sequences:  A240443 A240444 A240445 * A240447 A240448 A240449

KEYWORD

nonn,more

AUTHOR

Heinrich Ludwig, May 09 2014

EXTENSIONS

a(12)-a(14) from Heinrich Ludwig, Dec 01 2016

STATUS

approved

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Last modified December 10 04:15 EST 2019. Contains 329885 sequences. (Running on oeis4.)