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 A190967 a(n) = 4*a(n-1) - 9*a(n-2), with a(0)=0, a(1)=1. 2
 0, 1, 4, 7, -8, -95, -308, -377, 1264, 8449, 22420, 13639, -147224, -711647, -1521572, 318535, 14968288, 57006337, 93310756, -139814009, -1399052840, -4337885279, -4760065556, 20000705287, 122843411152, 311367297025, 139878487732, -2242791722297 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Index to sequences with linear recurrences with constant coefficients, signature (4,-9) FORMULA a(n)=(1/10*I)*sqrt(5)*((2-I*sqrt(5))^n -(2+I*sqrt(5))^n), Paolo P. Lava, May 31 2011 G.f.: x/(1-4x+9*x^2). - From Philippe DelĂ©ham, Oct 12 2011. MATHEMATICA LinearRecurrence[{4, -9}, {0, 1}, 50] CROSSREFS Cf. A190958 (index to generalized Fibonacci sequences) Sequence in context: A160629 A093105 A141669 * A004787 A210617 A191762 Adjacent sequences:  A190964 A190965 A190966 * A190968 A190969 A190970 KEYWORD sign,easy AUTHOR Vladimir Joseph Stephan Orlovsky, May 24 2011 STATUS approved

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Last modified May 23 14:38 EDT 2013. Contains 225604 sequences.