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 A074622 7^n + 8^n. 2
 2, 15, 113, 855, 6497, 49575, 379793, 2920695, 22542017, 174571335, 1356217073, 10567261335, 82560763937, 646644824295, 5076269583953, 39931933598775, 314707907280257, 2484430327672455, 19642812107392433, 155514083261229015 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA G.f.: 1/(1-7*x)+1/(1-8*x). E.g.f.: e^(7*x)+e^(8*x). [From Mohammad K. Azarian, Jan 11 2009] a(n)=15*a(n-1)-56*a(n-2) with a(0)=2, a(1)=15 [From Vincenzo Librandi, Jul 21 2010] MATHEMATICA Table[7^n + 8^n, {n, 0, 20}] CROSSREFS Cf. A000051, A034472, A052539, A034474, A062394, A034491, A062395, A062396, A007689, A063376, A063481, A074600 - A074624. Sequence in context: A022026 A026113 A052874 * A031507 A207998 A052861 Adjacent sequences:  A074619 A074620 A074621 * A074623 A074624 A074625 KEYWORD easy,nonn AUTHOR Robert G. Wilson v, Aug 26 2002 STATUS approved

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