A159222 - OEIS

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A159222

1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 21

%I #4 Dec 18 2015 18:17:18

%S 7,20,45,95,193,389,777,1553,3097,6185,12345,24665,49273,98489,196857,

%T 393593,786937,1573625,3146745,6292985,12584953,25168889,50335737,

%U 100669433,201334777,402665465

%N 1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 21

%K nonn

%O 2,1

%A _R. H. Hardin_ Apr 06 2009