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A159230 1/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 31 0
2, 5, 10, 20, 38, 74, 142, 278, 542, 1070, 2110, 4190, 8318, 16574, 33022, 65918, 131582, 262910, 525310, 1050110, 2099198, 4197374, 8392702, 16783358, 33562622, 67121150, 134234110 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Same series for 1/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 9

Same series for 1/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 13

Same series for 1/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 19

LINKS

Table of n, a(n) for n=2..28.

CROSSREFS

Sequence in context: A275388 A341581 A001629 * A181366 A068034 A222082

Adjacent sequences:  A159227 A159228 A159229 * A159231 A159232 A159233

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 06 2009

STATUS

approved

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Last modified April 21 15:55 EDT 2021. Contains 343156 sequences. (Running on oeis4.)