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Number of n X n arrays of squares of integers with every (n-3)X(n-3) subblock summing to 5 and every element equal to at least one neighbor.
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%I #7 Dec 18 2015 18:17:14

%S 0,540,24646,108226,315281,734060,1477489,2682776,4511681,7150588,

%T 10810505,15727064,22160521,30395756,40742273,53534200,69130289,

%U 87913916,110293081

%N Number of n X n arrays of squares of integers with every (n-3)X(n-3) subblock summing to 5 and every element equal to at least one neighbor.

%F Empirical (for n>=10): a(n) = 1026*n^4 - 20236*n^3 + 152815*n^2 - 529236*n + 720920. - _Vaclav Kotesovec_, Nov 30 2012

%K nonn

%O 5,2

%A _R. H. Hardin_ Apr 14 2009