A159201 Number of n X n arrays of squares of integers with every 3X3 subblock summing to 4.

135, 767, 3223, 10863, 41455, 133967, 386559, 1297583, 3874159, 10725327, 34367791, 100153391, 275262975, 866491247, 2509423663, 6914468943

Offset

3,1

Links

Table of n, a(n) for n=3..18.

Crossrefs

Sequence in context: A215173 A225360 A328651 * A362400 A211680 A212610

Adjacent sequences: A159198 A159199 A159200 * A159202 A159203 A159204

Keyword

nonn

Author

R. H. Hardin, Apr 06 2009

Status

approved