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A026390 Expansion of (2 + x + x^2)/((1 - x)*(1 - x - x^2)). 1
2, 5, 11, 20, 35, 59, 98, 161, 263, 428, 695, 1127, 1826, 2957, 4787, 7748, 12539, 20291, 32834, 53129, 85967, 139100, 225071, 364175, 589250, 953429, 1542683, 2496116, 4038803, 6534923, 10573730 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..30.

FORMULA

a(n) = A022086(n+3) - 4.

MATHEMATICA

Fibonacci[Range[3, 5!]]*3-4 (* Vladimir Joseph Stephan Orlovsky, Nov 23 2010 *)

PROG

(PARI) Vec((2+x+x^2)/((1-x)*(1-x-x^2))+O(x^99)) \\ Charles R Greathouse IV, Sep 27 2012

CROSSREFS

Cf. A022086.

Sequence in context: A261227 A022908 A256310 * A005575 A294745 A050407

Adjacent sequences:  A026387 A026388 A026389 * A026391 A026392 A026393

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 22 08:47 EST 2018. Contains 298042 sequences.