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A137213 First differences of A137212. 0
0, 1, 4, 15, 52, 173, 560, 1779, 5576, 17305, 53308, 163287, 497980, 1513541, 4587944, 13878075, 41910032, 126395953, 380795380, 1146267039, 3448170436, 10367130845, 31156000928, 93599839107, 281117798360, 844121793481 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..25.

Index entries for linear recurrences with constant coefficients, signature (5,-5,-3).

FORMULA

O.g.f.: 1/(x^2+2*x-1)-1/(3*x-1) = -x*(-1+x) / ( (3*x-1)*(x^2+2*x-1) ). a(n)= 3^n-A000129(n+1). - R. J. Mathar, Mar 17 2008

MATHEMATICA

LinearRecurrence[{5, -5, -3}, {0, 1, 4}, 30] (* Harvey P. Dale, Apr 18 2019 *)

CROSSREFS

Cf. A132894.

Sequence in context: A003013 A117202 A291011 * A027853 A132894 A117917

Adjacent sequences:  A137210 A137211 A137212 * A137214 A137215 A137216

KEYWORD

nonn

AUTHOR

Paul Curtz, Mar 06 2008

EXTENSIONS

More terms from R. J. Mathar, Mar 17 2008

STATUS

approved

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Last modified February 26 18:29 EST 2020. Contains 332293 sequences. (Running on oeis4.)