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A159225 1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 25 0

%I

%S 7,24,53,135,265,621,1169,2649,4897,10929,20033,44385,81025,178881,

%T 325889,718209,1307137,2878209,5235713,11523585,20957185,46115841,

%U 83857409,184506369,335486977

%N 1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 25

%F Conjecture: G.f.: x^2*(-7-12*x^4+20*x^3+13*x^2-17*x)/((x-1)*(2*x+1)*(2*x-1)*(2*x^2-1)) [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009]

%K nonn

%O 2,1

%A _R. H. Hardin_ Apr 06 2009

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Last modified May 25 02:55 EDT 2022. Contains 354047 sequences. (Running on oeis4.)