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 A037486 Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,2. 0
 1, 11, 100, 902, 8119, 73073, 657658, 5918924, 53270317, 479432855, 4314895696, 38834061266, 349506551395, 3145558962557, 28310030663014, 254790275967128, 2293112483704153 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Index entries for sequences related to linear recurrences with constant coefficients, signature (9,1,-9). FORMULA a(n) = 9*a(n-1) + a(n-2) - 9*a(n-3). G.f.: x*(1+2*x)/((1-9*x)*(1-x^2)). a(n) = (11*9^n+4*(-1)^n-15)/80. - Bruno Berselli, Jan 20 2011 CROSSREFS Sequence in context: A081906 A098296 A037542 * A103720 A127806 A036929 Adjacent sequences:  A037483 A037484 A037485 * A037487 A037488 A037489 KEYWORD nonn,base,easy AUTHOR STATUS approved

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