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A276280
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Number of triangular partitions of n of order 9.
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1
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1, 9, 45, 173, 567, 1654, 4422, 11040, 26051, 58638, 126778, 264670, 535806, 1055480, 2028884, 3814688, 7029559, 12717703, 22622719, 39618458, 68384638, 116456100, 195837008, 325462408, 534921468, 870044724, 1401226327, 2235733481, 3535790660
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: 1/((1-x)^9*(1-x^3)^8*(1-x^5)^7*(1-x^7)^6*(1-x^9)^5*(1-x^11)^4*(1-x^13)^3*(1-x^15)^2*(1-x^17)).
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MATHEMATICA
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CoefficientList[Series[1/((1-x)^9 (1-x^3)^8 (1-x^5)^7 (1-x^7)^6 (1-x^9)^5 (1-x^11)^4 (1-x^13)^3 (1-x^15)^2 (1-x^17)), {x, 0, 50}], x]
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PROG
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(Magma) m:=50; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/((1-x)^9*(1-x^3)^8*(1-x^5)^7*(1-x^7)^6*(1-x^9)^5*(1-x^11)^4*(1-x^13)^3*(1-x^15)^2*(1-x^17))));
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CROSSREFS
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Cf. similar sequences listed in A276235.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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