

A122874


List of pairs n+7, 13n, n >= 0.


1



7, 13, 8, 12, 9, 11, 10, 10, 11, 9, 12, 8, 13, 7, 14, 6, 15, 5, 16, 4, 17, 3, 18, 2, 19, 1, 20, 0, 21, 1, 22, 2, 23, 3, 24, 4, 25, 5, 26, 6, 27, 7, 28, 8, 29, 9, 30, 10, 31, 11, 32, 12, 33, 13, 34, 14, 35, 15, 36, 16, 37, 17, 38, 18, 39, 19, 40, 20, 41, 21, 42
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OFFSET

0,1


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1,1,1).


FORMULA

a(n) = a(n1)+a(n2)+a(n3). G.f.: (7+20*x+14*x^2)/((x1)*(1+x)^2). [R. J. Mathar, Aug 07 2009]


MATHEMATICA

CoefficientList[Series[(7 + 20 x + 14 x^2)/((x  1) (1 + x)^2), {x, 0, 100}], x] (* Vincenzo Librandi, May 25 2014 *)


PROG

(MAGMA) &cat[[n+7, 13n]: n in [0..30]]; // Vincenzo Librandi, May 25 2014


CROSSREFS

Sequence in context: A130770 A158622 A215990 * A066003 A115858 A114389
Adjacent sequences: A122871 A122872 A122873 * A122875 A122876 A122877


KEYWORD

sign,tabf,easy


AUTHOR

Stuart M. Ellerstein (ellerstein(AT)aol.com), Oct 23 2006


EXTENSIONS

Edited with better definition by Omar E. Pol and N. J. A. Sloane, Jan 02 2009
More terms from R. J. Mathar, Aug 07 2009


STATUS

approved



