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A077849
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Expansion of (1-x)^(-1)/(1 - 2*x - x^2 - x^3).
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3
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1, 3, 8, 21, 54, 138, 352, 897, 2285, 5820, 14823, 37752, 96148, 244872, 623645, 1588311, 4045140, 10302237, 26237926, 66823230, 170186624, 433434405, 1103878665, 2811378360, 7160069791, 18235396608, 46442241368, 118279949136, 301237536249, 767197263003
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OFFSET
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0,2
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LINKS
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MAPLE
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A077939 := proc(n) if n< 0 then 0; else coeftayl( 1/(1-2*x-x^2-x^3) , x=0, n) ; end if; end proc:
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MATHEMATICA
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CoefficientList[Series[(1-x)^(-1)/(1-2x-x^2-x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{3, -1, 0, -1}, {1, 3, 8, 21}, 40] (* Harvey P. Dale, Nov 01 2016 *)
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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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