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A280756
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Expansion of (1 + 2*x)/(1 - x - 4*x^2 + x^4).
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1
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1, 3, 7, 19, 46, 119, 296, 753, 1891, 4784, 12052, 30435, 76752, 193708, 488664, 1233061, 3110965, 7849501, 19804697, 49969640, 126077463, 318106522, 802611677, 2025068125, 5109437370, 12891603348, 32526741151, 82068086418, 207065613652, 522446355976, 1318182069433, 3325899406919
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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CoefficientList[Series[(1+2x)/(1-x-4x^2+x^4), {x, 0, 40}], x] (* or *) LinearRecurrence[ {1, 4, 0, -1}, {1, 3, 7, 19}, 40] (* Harvey P. Dale, Jun 23 2022 *)
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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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