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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
7, 24, 53, 135, 265, 621, 1169, 2649, 4897, 10929, 20033, 44385, 81025, 178881, 325889, 718209, 1307137, 2878209, 5235713, 11523585, 20957185, 46115841, 83857409, 184506369, 335486977 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..26.

FORMULA

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]

CROSSREFS

Sequence in context: A006707 A196116 A168668 * A146298 A079671 A212511

Adjacent sequences:  A159222 A159223 A159224 * A159226 A159227 A159228

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 06 2009

STATUS

approved

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Last modified January 28 12:42 EST 2022. Contains 350656 sequences. (Running on oeis4.)