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A199802
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G.f.: 1/(1-2*x+2*x^2-x^3+x^4).
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4
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1, 2, 2, 1, -1, -4, -7, -8, -5, 3, 15, 27, 32, 22, -8, -55, -104, -128, -95, 17, 200, 399, 510, 405, -11, -721, -1525, -2024, -1708, -172, 2573, 5806, 8002, 7137, 1503, -9072, -22015, -31520, -29585, -9073, 31519, 83119, 123712, 121778, 47732, -107499, -312396, -483840, -498119, -233455, 357884, 1168399, 1885694, 2025929, 1090985, -1152593
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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/(1-2x+2x^2-x^3+x^4), {x, 0, 60}], x] (* or *) LinearRecurrence[ {2, -2, 1, -1}, {1, 2, 2, 1}, 60] (* Harvey P. Dale, May 11 2022 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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