A159361 Number of n X n arrays of squares of integers with every (n-2)X(n-2) subblock summing to 5

68, 3974, 489344, 11519386, 120219092, 783628988, 3750168768, 14410898388, 46984276484, 134788006082, 348991646336, 830716777310, 1843200453460, 3853005291320, 7651988628800, 14534976588312, 26551869394500

Offset

4,1

Links

R. H. Hardin, Table of n, a(n) for n=4..25

Formula

Empirical G.f.: -80*x^3 - 2*x^3*(40 - 406*x + 3813*x^2 + 218085*x^3 + 3185176*x^4 + 9874768*x^5 + 7680205*x^6 + 626909*x^7 - 183350*x^8 + 4896*x^9 + 288*x^10)/(-1+x)^11. - Vaclav Kotesovec, Nov 30 2012

Crossrefs

Sequence in context: A281556 A093268 A231250 * A004298 A223226 A252977

Adjacent sequences: A159358 A159359 A159360 * A159362 A159363 A159364

Keyword

nonn

Author

R. H. Hardin Apr 11 2009

Status

approved