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A159228
1/12 the number of n X n arrays of squares of integers with every 2 X 2 subblock summing to 29.
0
3, 12, 33, 95, 237, 665, 1669, 4765, 12213, 35557, 92693, 273525, 720597, 2143125, 5679189, 16962005, 45087573, 134958677
OFFSET
2,1
FORMULA
Empirical G.f.: 1+(-1+x+17*x^2-5*x^3-77*x^4-8*x^5+80*x^6)/((-1+x)*(-1+2*x)*(1+2*x)*(-1+2*x^2)*(-1+8*x^2)). - Vaclav Kotesovec, Nov 30 2012
CROSSREFS
Sequence in context: A054602 A083725 A192972 * A054610 A183468 A196234
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 06 2009
STATUS
approved