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A159386
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Number of n X n arrays of squares of integers summing to 12.
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1
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8, 1857, 232740, 26296475, 2128426860, 110964458710, 3533207162352, 73077185537370, 1067559034014900, 11805270721428855, 104131103837358468, 762072014041423813, 4768129728862470880, 26106675760931007900, 127411116947126838720, 562536757736562399012
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OFFSET
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2,1
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LINKS
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R. H. Hardin, Table of n, a(n) for n=2..100
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FORMULA
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Empirical G.f.: -x^2*(1+x)*(8 + 1649*x + 187066*x^2 + 20829609*x^3 + 1515837476*x^4 + 63614656244*x^5 + 1276374119248*x^6 + 12185198155972*x^7 + 58755893406228*x^8 + 149482468806702*x^9 + 204117353324396*x^10 + 149482468806702*x^11 + 58755893406228*x^12 + 12185198155972*x^13 + 1276374119248*x^14 + 63614656244*x^15 + 1515837476*x^16 + 20829609*x^17 + 187066*x^18 + 1649*x^19 + 8*x^20)/(-1+x)^25. - Vaclav Kotesovec, Nov 30 2012
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CROSSREFS
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Sequence in context: A050648 A292695 A070903 * A160302 A002672 A027515
Adjacent sequences: A159383 A159384 A159385 * A159387 A159388 A159389
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Apr 11 2009
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STATUS
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approved
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