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A259969 a(n) = n*A259968(n). 3
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)
OFFSET

0,3

REFERENCES

R. K. Guy, Letter to N. J. A. Sloane, Feb 05 1986.

LINKS

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).

FORMULA

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

PROG

(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

CROSSREFS

Cf. A259968, A259967.

Sequence in context: A185669 A294872 A006002 * A023662 A131357 A274543

Adjacent sequences:  A259966 A259967 A259968 * A259970 A259971 A259972

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 11 2015

EXTENSIONS

a(28)-a(33) from Hiroaki Yamanouchi, Jul 12 2015

STATUS

approved

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Last modified April 18 05:44 EDT 2021. Contains 343072 sequences. (Running on oeis4.)