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A004395
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Ratios of successive terms are 1,1,2,3,3,4,5,5,6,7,7,...
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2
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1, 1, 1, 2, 6, 18, 72, 360, 1800, 10800, 75600, 529200, 4233600, 38102400, 342921600, 3429216000, 37721376000, 414935136000, 4979221632000, 64729881216000, 841488455808000, 11780838381312000, 176712575719680000
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OFFSET
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0,4
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LINKS
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FORMULA
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G.f.: hypergeom([1/2, 1/2, 1, 1], [], 8*x^3) + x*hypergeom([1/2, 1, 1, 3/2], [], 8*x^3) + x^2*hypergeom([1, 1, 3/2, 3/2], [], 8*x^3). - Robert Israel, Aug 05 2020
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MAPLE
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G:=hypergeom([1/2, 1/2, 1, 1], [], 8*x^3) + x*hypergeom([1/2, 1, 1, 3/2], [], 8*x^3) + x^2*hypergeom([1, 1, 3/2, 3/2], [], 8*x^3):
S:= series(G, x, 41):
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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