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A055583
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Seventh column of triangle A055252.
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3
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1, 10, 58, 256, 955, 3178, 9740, 28064, 77093, 203930, 523262, 1309520, 3209871, 7731642, 18348240, 42989520, 99612345, 228586890, 520090690, 1174401760, 2634019171, 5872021450, 13019115028, 28722588736, 63082326605
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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/(((1-2*x)^3)*(1-x)^4).
a(n) = Sum_{j=0..n-1} a(j) + A055250(n), n >= 1.
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MATHEMATICA
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CoefficientList[Series[1/(((1 - 2 x)^3) (1 - x)^4), {x, 0, 24}], x] (* Michael De Vlieger, Apr 24 2020 *)
LinearRecurrence[{10, -42, 96, -129, 102, -44, 8}, {1, 10, 58, 256, 955, 3178, 9740}, 30] (* Harvey P. Dale, Nov 06 2022 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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