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 A066280 1^n + 2^(n+1) + 3^(n+2). 2
 5, 12, 32, 90, 260, 762, 2252, 6690, 19940, 59562, 178172, 533490, 1598420, 4791162, 14365292, 43079490, 129205700, 387551562, 1162523612, 3487308690, 10461401780, 31383156762, 94147373132, 282437925090, 847305386660 (list; graph; refs; listen; history; text; internal format)
 OFFSET -1,1 LINKS Harry J. Smith, Table of n, a(n) for n=-1,...,200 Index entries for linear recurrences with constant coefficients, signature (6, -11, 6). FORMULA 1 + A000079(n) + A000244(n+1) a(n)= 6*a(n-1) -11*a(n-2) +6*a(n-3). G.f.: (-18*x+15*x^2+5)/((1-x) * (3*x-1) * (2*x-1) * x). [From R. J. Mathar, Feb 19 2010] MATHEMATICA Table[ 1^(n + 1) + 2^(n + 2) + 3^(n + 3), {n, -2, 24} ] PROG (PARI) { for (n=-1, 200, write("b066280.txt", n, " ", 1^n + 2^(n + 1) + 3^(n + 2)) ) } [From Harry J. Smith, Feb 08 2010] CROSSREFS Sequence in context: A090974 A038606 A192303 * A192243 A136113 A050189 Adjacent sequences:  A066277 A066278 A066279 * A066281 A066282 A066283 KEYWORD nonn AUTHOR George E. Antoniou (george.antoniou(AT)montclair.edu), Dec 10 2001 EXTENSIONS More terms from Robert G. Wilson v, Dec 11 2001 STATUS approved

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