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A136305 Transform of A000027 by the T_{1,2} transformation (see link). 3
3, 8, 20, 47, 109, 253, 588, 1367, 3178, 7388, 17175, 39927, 92819, 215778, 501623, 1166132, 2710928, 6302143, 14650705, 34058757, 79177004, 184064203, 427897358, 994740672, 2312491503, 5375890523, 12497429235, 29052998162, 67540026539, 157011512528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..30.

Richard Choulet, Curtz-like transformation.

Index entries for linear recurrences with constant coefficients, signature (3,-2,1).

FORMULA

G.f.: f(z)=3+8*z+...=(3-z+2*z^2)/(1-3*z+2*z^2-z^3).

a(n+3) = 3*a(n+2)-2*a(n+1)+a(n) (n>=0). [Richard Choulet, Apr 07 2009]

CROSSREFS

Sequence in context: A291097 A293883 A050231 * A284943 A026712 A308370

Adjacent sequences:  A136302 A136303 A136304 * A136306 A136307 A136308

KEYWORD

nonn,easy

AUTHOR

Richard Choulet, Mar 22 2008

STATUS

approved

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Last modified July 23 22:18 EDT 2019. Contains 325269 sequences. (Running on oeis4.)