A146506 Number of n X n arrays of squares of integers summing to 18 with every element equal to at least one neighbor.

4, 90, 12424, 2808172, 449235282, 107282960684, 5345302912844, 102834566977650

Offset

2,1

Links

Table of n, a(n) for n=2..9.

Crossrefs

Sequence in context: A274056 A339987 A202918 * A202575 A201721 A374158

Adjacent sequences: A146503 A146504 A146505 * A146507 A146508 A146509

Keyword

nonn

Author

R. H. Hardin Apr 14 2009

Status

approved