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A170738
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Expansion of g.f.: (1+x)/(1-18*x).
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50
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1, 19, 342, 6156, 110808, 1994544, 35901792, 646232256, 11632180608, 209379250944, 3768826516992, 67838877305856, 1221099791505408, 21979796247097344, 395636332447752192, 7121453984059539456, 128186171713071710208, 2307351090835290783744, 41532319635035234107392
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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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MAPLE
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k:=19; seq(`if`(n=0, 1, k*(k-1)^(n-1)), n = 0..25); # G. C. Greubel, Sep 24 2019
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MATHEMATICA
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CoefficientList[Series[(1+x)/(1-18x), {x, 0, 20}], x] (* or *) LinearRecurrence[ {18}, {1, 19}, 20] (* Harvey P. Dale, Jul 01 2017 *)
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PROG
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(Python) for i in range(31):print(i, 19*18**(i-1) if i>0 else 1) # Kenny Lau, Aug 01 2017
(PARI) vector(26, n, k=19; if(n==1, 1, k*(k-1)^(n-2))) \\ G. C. Greubel, Sep 24 2019
(Magma) k:=19; [1] cat [k*(k-1)^(n-1): n in [1..25]]; // G. C. Greubel, Sep 24 2019
(Sage) k=19; [1]+[k*(k-1)^(n-1) for n in (1..25)] # G. C. Greubel, Sep 24 2019
(GAP) k:=19;; Concatenation([1], List([1..25], n-> k*(k-1)^(n-1) )); # G. C. Greubel, Sep 24 2019
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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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