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A159375 Number of n X n arrays of squares of integers summing to 9 1
16, 766, 61184, 3112500, 105851488, 2138413851, 27990555776, 262835331687, 1909384608000, 11319915386120, 56916060868096, 249702337698346, 976762617522160, 3464394870851125, 11290721919375872, 34177386571594701 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

R. H. Hardin, Table of n, a(n) for n=2..100

FORMULA

Empirical G.f.: -x-(1+x)*x*(1 - 4*x + 637*x^2 + 47760*x^3 + 2021602*x^4 + 54462984*x^5 + 548532899*x^6 + 2125377516*x^7 + 3360726010*x^8 + 2125377516*x^9 + 548532899*x^10 + 54462984*x^11 + 2021602*x^12 + 47760*x^13 + 637*x^14 - 4*x^15 + x^16)/(-1+x)^19. - Vaclav Kotesovec, Nov 30 2012

CROSSREFS

Sequence in context: A218297 A339202 A307923 * A221527 A129008 A134183

Adjacent sequences:  A159372 A159373 A159374 * A159376 A159377 A159378

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 11 2009

STATUS

approved

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Last modified August 16 00:08 EDT 2022. Contains 356150 sequences. (Running on oeis4.)