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A159228 1/12 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 29 0
3, 12, 33, 95, 237, 665, 1669, 4765, 12213, 35557, 92693, 273525, 720597, 2143125, 5679189, 16962005, 45087573, 134958677 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..19.

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

Adjacent sequences:  A159225 A159226 A159227 * A159229 A159230 A159231

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 06 2009

STATUS

approved

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Last modified December 7 13:08 EST 2021. Contains 349581 sequences. (Running on oeis4.)