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A297189
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Expansion of (x + 3*x^2 - 2*x^3 - 3*x^4)/(1 - 8*x^2 + 9*x^4).
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1
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0, 1, 3, 6, 21, 39, 141, 258, 939, 1713, 6243, 11382, 41493, 75639, 275757, 502674, 1832619, 3340641, 12179139, 22201062, 80939541, 147542727, 537904077, 980532258, 3574776747, 6516373521, 23757077283, 43306197846, 157883627541, 287802221079
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OFFSET
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0,3
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COMMENTS
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Related to a tiling of the plane by heptagons.
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LINKS
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FORMULA
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PROG
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(PARI) concat(0, Vec((x + 3*x^2 - 2*x^3 - 3*x^4)/(1 - 8*x^2 + 9*x^4) + O(x^40))) \\ Colin Barker, Jan 05 2018
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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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