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A212340
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G.f.: 1/(1-x-x^2-2*x^3-5*x^4).
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0
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1, 1, 2, 5, 14, 28, 62, 143, 331, 738, 1665, 3780, 8576, 19376, 43837, 99265, 224734, 508553, 1151002, 2605348, 5897126, 13347243, 30210075, 68378310, 154768501, 350303176, 792878672, 1794610400, 4061937929, 9193821553, 20809373642, 47100123053, 106606829446, 241294807548
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OFFSET
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0,3
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COMMENTS
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Sequence of coefficients of x^0 in marked mesh pattern generating function Q_{n,132}^(0,0,4,0)(x).
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LINKS
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MATHEMATICA
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QQQ4[t, x] = 2/(1 +(t*x-t) *(1+t+2*t^2+5*t^3) + ((1+(t*x-t) *(1+t+2*t^2+5*t^3))^2 -4*t*x)^(1/2)); q = Simplify[Series[QQQ4[t, x], {t, 0, 22}]]; CoefficientList[q /. x -> 0, t] (* Robert Price, Jun 04 2012 *)
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PROG
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(PARI) Vec(1/(1-x-x^2-2*x^3-5*x^4) + O(x^100)) \\ Altug Alkan, Nov 01 2015
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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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EXTENSIONS
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STATUS
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approved
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