A146196 Number of n X n arrays of squares of integers with every (n-3)X(n-3) subblock summing to 5 and every element equal to at least one neighbor.

0, 540, 24646, 108226, 315281, 734060, 1477489, 2682776, 4511681, 7150588, 10810505, 15727064, 22160521, 30395756, 40742273, 53534200, 69130289, 87913916, 110293081

Offset

5,2

Links

Table of n, a(n) for n=5..23.

Formula

Empirical (for n>=10): a(n) = 1026*n^4 - 20236*n^3 + 152815*n^2 - 529236*n + 720920. - Vaclav Kotesovec, Nov 30 2012

Crossrefs

Sequence in context: A159207 A101705 A034620 * A054562 A056934 A238933

Adjacent sequences: A146193 A146194 A146195 * A146197 A146198 A146199

Keyword

nonn

Author

R. H. Hardin, Apr 14 2009

Status

approved