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0, 1, 2, 9, 24, 50, 102, 210, 424, 837, 1630, 3146, 6024, 11453, 21644, 40695, 76176, 142035, 263916, 488870, 903060, 1663998, 3059166, 5612483, 10277448, 18787150, 34287916, 62485371, 113715448, 206683725, 375211710, 680399005, 1232533696, 2230537914
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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REFERENCES
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R. K. Guy, Letter to N. J. A. Sloane, Feb 05 1986.
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LINKS
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Colin Barker, Table of n, a(n) for n = 0..1000
R. K. Guy, Letter to N. J. A. Sloane, Feb 1986
Index entries for linear recurrences with constant coefficients, signature (4,-6,6,-5,2,-1).
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FORMULA
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G.f.: x*(x^4-6*x^3+7*x^2-2*x+1) / (x^3-x^2+2*x-1)^2. - Colin Barker, Jul 12 2015
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PROG
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(PARI) concat(0, Vec(x*(x^4-6*x^3+7*x^2-2*x+1)/(x^3-x^2+2*x-1)^2 + O(x^40))) \\ Colin Barker, Jul 12 2015
(Haskell)
a259967 n = a259967_list !! n
a259967_list = 3 : 2 : 2 : 5 : zipWith3 (((+) .) . (+))
a259967_list (drop 2 a259967_list) (drop 3 a259967_list)
-- Reinhard Zumkeller, Jul 12 2015
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CROSSREFS
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Cf. A259968, A259967.
Sequence in context: A360518 A294872 A006002 * A023662 A131357 A274543
Adjacent sequences: A259966 A259967 A259968 * A259970 A259971 A259972
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, Jul 11 2015
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EXTENSIONS
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a(28)-a(33) from Hiroaki Yamanouchi, Jul 12 2015
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STATUS
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approved
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