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 A014903 a(1)=1, a(n) = 19*a(n-1) + n. 3
 1, 21, 402, 7642, 145203, 2758863, 52418404, 995949684, 18923044005, 359537836105, 6831218886006, 129793158834126, 2466070017848407, 46855330339119747, 890251276443275208, 16914774252422228968, 321380710796022350409, 6106233505124424657789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..200 Index entries for linear recurrences with constant coefficients, signature (21, -39, 19). FORMULA a(n) = -19/324 - (1/18)*n + (19/324)*19^n, with n >= 1. - Paolo P. Lava, Jan 14 2009 a(1)=1, a(2)=21, a(3)=402, a(n) = 21*a(n-1) - 39*a(n-2) + 19*a(n-3). - Vincenzo Librandi, Oct 20 2012 MATHEMATICA LinearRecurrence[{21, -39, 19}, {1, 21, 402}, 20] (* Vincenzo Librandi, Oct 20 2012 *) PROG (Magma) I:=[1, 21, 402]; [n le 3 select I[n] else 21*Self(n-1) - 39*Self(n-2) + 19*Self(n-3): n in [1..20]]; // Vincenzo Librandi, Oct 20 2012 CROSSREFS Sequence in context: A113363 A223459 A240655 * A219308 A358698 A020534 Adjacent sequences: A014900 A014901 A014902 * A014904 A014905 A014906 KEYWORD nonn AUTHOR STATUS approved

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Last modified November 29 04:45 EST 2022. Contains 358422 sequences. (Running on oeis4.)