A159230 1/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 31.

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

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,more

Author

R. H. Hardin, Apr 06 2009

Status

approved