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 A017617 a(n) = 12*n+8. 9
 8, 20, 32, 44, 56, 68, 80, 92, 104, 116, 128, 140, 152, 164, 176, 188, 200, 212, 224, 236, 248, 260, 272, 284, 296, 308, 320, 332, 344, 356, 368, 380, 392, 404, 416, 428, 440, 452, 464, 476, 488, 500, 512, 524, 536, 548, 560, 572, 584, 596, 608, 620, 632 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A089911(a(n)) = 9. - Reinhard Zumkeller, Jul 05 2013 Also the number of cube units that frame a cube of edge length n+1. Peter M. Chema, Mar 27 2016 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..3000 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). - Vincenzo Librandi, Jun 08 2011 EXAMPLE For n=3; a(3)= 12*3+8 = 44. Thus, there are 44 cube units that frame a cube of edge length 4. - Peter M. Chema, Mar 26 2016 MATHEMATICA 12*Range[0, 200]+8 (* Vladimir Joseph Stephan Orlovsky, Feb 19 2011*) PROG (MAGMA) [12*n+8: n in [0..60]]; // Vincenzo Librandi, Jun 08 2011 (Haskell) a017617 = (+ 8) . (* 12)  -- Reinhard Zumkeller, Jul 05 2013 (PARI) x='x+O('x^99); Vec(4*(2+x)/(1-x)^2) \\ Altug Alkan, Mar 27 2016 CROSSREFS Cf. A008594, A017533, A017545, A016957, A016789. Sequence in context: A022757 A246308 A194218 * A246309 A038522 A267435 Adjacent sequences:  A017614 A017615 A017616 * A017618 A017619 A017620 KEYWORD nonn,easy AUTHOR STATUS approved

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