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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

%I #7 Dec 18 2015 18:17:14

%S 0,18,1070,8266,33102,97050,236458,508330,997046,1822042,3146450,

%T 5186698,8223070,12611226,18794682,27318250,38842438,54158810,

%U 74206306,100088522,133091950,174705178,226639050,290847786

%N Number of n X n arrays of squares of integers summing to 6 with every element equal to at least one neighbor.

%F 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

%K nonn

%O 2,2

%A _R. H. Hardin_ Apr 14 2009

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Last modified April 25 01:06 EDT 2024. Contains 371964 sequences. (Running on oeis4.)