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A016212
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Expansion of 1/((1-x)*(1-3*x)*(1-7*x)).
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5
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1, 11, 90, 670, 4811, 34041, 239380, 1678940, 11762421, 82366471, 576653870, 4036842810, 28258696831, 197813269301, 1384700059560, 9692921940280, 67850518152041, 474953820774531, 3324677326552450, 23272743029259350, 162909206434992051, 1140364460735474161
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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) = 11*a(n-1) - 31*a(n-2) + 21*a(n-3). - Matthew House, Jan 13 2017
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MAPLE
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a:=n->sum((7^(n-j)-3^(n-j))/4, j=0..n): seq(a(n), n=1..19); # Zerinvary Lajos, Jan 15 2007
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PROG
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CROSSREFS
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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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