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A146197 Number of n X n arrays of squares of integers summing to 6 with every element equal to at least one neighbor. 1
0, 18, 1070, 8266, 33102, 97050, 236458, 508330, 997046, 1822042, 3146450, 5186698, 8223070, 12611226, 18794682, 27318250, 38842438, 54158810, 74206306, 100088522, 133091950, 174705178, 226639050, 290847786 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..25.

FORMULA

Empirical (for n>=5): a(n) = 4*n^6/3 - 4*n^5 + 14*n^4 - 178*n^3/3 - 886*n^2/3 + 3958*n/3 - 614. - Vaclav Kotesovec, Nov 30 2012

CROSSREFS

Sequence in context: A214181 A275653 A214232 * A159379 A052135 A033518

Adjacent sequences:  A146194 A146195 A146196 * A146198 A146199 A146200

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 14 2009

STATUS

approved

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Last modified May 26 18:26 EDT 2017. Contains 287129 sequences.