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 A097168 Expansion of (1-7x)/((1-x)(1-9x)(1-10x). 2
 1, 13, 151, 1693, 18571, 200473, 2137591, 22571653, 236478211, 2461637233, 25488068431, 262725949213, 2697866876251, 27614135219593, 281860550309671, 2870078286120373, 29164037908416691, 295809674509083553 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Partial sums of A097167. a(n)=A097169(2n+1)/4. LINKS Index entries for linear recurrences with constant coefficients, signature (20,-109,90). FORMULA a(n)=10*10^n/3-9*9^n/4-1/12; a(n)=20a(n-1)-109a(n-2)+90a(n-3). CROSSREFS Sequence in context: A051475 A242576 A173448 * A305262 A296722 A252972 Adjacent sequences:  A097165 A097166 A097167 * A097169 A097170 A097171 KEYWORD easy,nonn AUTHOR Paul Barry, Jul 30 2004 STATUS approved

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Last modified January 18 13:54 EST 2021. Contains 340254 sequences. (Running on oeis4.)