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A266943
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Expansion of Product_{k>=1} 1 / (1 - 2*x^k)^2.
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3
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1, 4, 16, 52, 160, 452, 1232, 3204, 8112, 19956, 48112, 113732, 264816, 607876, 1379264, 3096372, 6888784, 15201156, 33306752, 72510916, 156972960, 338089844, 724883552, 1547816708, 3292816416, 6981664708, 14758159472, 31110217524, 65415167744, 137230388228
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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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a(n) ~ c * n * 2^n, where c = 1/A048651^2 = 11.9906141505474711257730652493... .
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MATHEMATICA
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nmax = 40; CoefficientList[Series[Product[1/(1-2*x^k)^2, {k, 1, nmax}], {x, 0, nmax}], x]
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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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