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A076151
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a(n) = (n-1)!*binomial(3*n,n)/(3*(2*n+1)).
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1
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1, 8, 110, 2184, 57120, 1860480, 72681840, 3315312000, 173059286400, 10178348544000, 666172912204800, 48032775105638400, 3783468344527872000, 323279062935013785600, 29783920485745730304000, 2943352142120754524160000, 310589942708652231905280000
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OFFSET
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2,2
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LINKS
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FORMULA
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2*n*(2*n+1)*a(n) - 3*(n-1)*(3*n-1)*(3*n-2)*a(n-1) = 0. - R. J. Mathar, Jun 07 2013
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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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