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A083229 (3*3^n+(-5)^n)/4. 1
1, 1, 13, -11, 217, -599, 4453, -17891, 102577, -473519, 2485693, -12074171, 61433737, -303980039, 1529466133, -7618632851, 38179257697, -190638008159, 953964881773, -4767499885931, 23844472998457, -119201444285879, 596069983548613, -2980161631385411 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..300

Index to sequences with linear recurrences with constant coefficients, signature (-2,15)

FORMULA

G.f.: (1+3*x)/((1-3*x)*(1+5*x)).

E.g.f. (3*exp(3*x)+exp(-5*x))/4.

PROG

(MAGMA) [(3*3^n+(-5)^n)/4: n in [0..25]]; // Vincenzo Librandi, Jun 29 2011

CROSSREFS

Sequence in context: A206607 A196124 A196121 * A140554 A002591 A037055

Adjacent sequences:  A083226 A083227 A083228 * A083230 A083231 A083232

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 23 2003

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Last modified February 14 15:39 EST 2012. Contains 205635 sequences.