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 A199680 (11*9^n+1)/2. 1
 6, 50, 446, 4010, 36086, 324770, 2922926, 26306330, 236756966, 2130812690, 19177314206, 172595827850, 1553362450646, 13980262055810, 125822358502286, 1132401226520570, 10191611038685126, 91724499348166130, 825520494133495166 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (10,-9). FORMULA a(n) = 9*a(n-1)-4. a(n) = 10*a(n-1)-9*a(n-2). G.f.: 2*(3-5*x)/((1-x)*(1-9*x)). PROG (MAGMA) [(11*9^n+1)/2: n in [0..30]]; CROSSREFS Sequence in context: A090409 A212233 A180910 * A039742 A243667 A303562 Adjacent sequences:  A199677 A199678 A199679 * A199681 A199682 A199683 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Nov 09 2011 STATUS approved

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Last modified January 18 14:07 EST 2021. Contains 340254 sequences. (Running on oeis4.)