A146198 Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 6 and every element equal to at least one neighbor.

0, 40, 5606, 41698, 158360, 453388, 1097036, 2364072, 4672136, 8626500, 15071228, 25146736, 40353752, 62623676, 94395340, 138698168, 199241736, 280511732, 387872316, 527674880, 707373208

Offset

3,2

Links

Table of n, a(n) for n=3..23.

Formula

Empirical (for n>=7): a(n) = 80*n^6/9 - 401*n^5/3 + 10112*n^4/9 - 5809*n^3 + 145814*n^2/9 - 64942*n/3 + 11612. - Vaclav Kotesovec, Nov 30 2012

Crossrefs

Sequence in context: A270053 A123810 A275655 * A159376 A364507 A196706

Adjacent sequences: A146195 A146196 A146197 * A146199 A146200 A146201

Keyword

nonn

Author

R. H. Hardin Apr 14 2009

Status

approved