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A006090
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Expansion of bracket function.
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7
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1, -6, 21, -56, 126, -252, 463, -804, 1365, -2366, 4368, -8736, 18565, -40410, 87381, -184604, 379050, -758100, 1486675, -2884776, 5592405, -10919090, 21572460, -43144920, 87087001, -176565486, 357913941, -723002336
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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Problems Drive, Eureka, 37 (1974), 8-11, 32-33, 24-27. (Annotated scanned copy)
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FORMULA
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G.f.: 1/((1+x)^6-x^6).
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MATHEMATICA
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CoefficientList[Series[1/((1+x)^6-x^6), {x, 0, 30}], x] (* or *) LinearRecurrence[ {-6, -15, -20, -15, -6}, {1, -6, 21, -56, 126}, 31] (* Harvey P. Dale, Oct 14 2016 *)
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PROG
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(PARI) x='x+O('x^50); Vec(1/((1+x)^6-x^6)) \\ G. C. Greubel, Jul 02 2017
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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