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 A023443 a(n) = n - 1. 39
 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (2, -1). FORMULA a(n) = 2*a(n-1) -a(n-2). G.f.: (-1+2*x)/(x-1)^2. - R. J. Mathar, Feb 11 2010 MATHEMATICA Range[0, 80]-1 (* Harvey P. Dale, Apr 05 2012 *) LinearRecurrence[{2, -1}, {-1, 0}, 75] (* Ray Chandler, Jul 30 2015 *) PROG (PARI) a(n)=n-1 \\ Charles R Greathouse IV, Aug 26 2011 CROSSREFS Cf. A000027, A023444, ..., A023482, A022958, ..., A022996, A256958. Sequence in context: A173474 * A099570 A114142 A020725 A119972 A131738 Adjacent sequences:  A023440 A023441 A023442 * A023444 A023445 A023446 KEYWORD sign,easy AUTHOR STATUS approved

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Last modified November 17 14:18 EST 2018. Contains 317276 sequences. (Running on oeis4.)