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 A091686 a(n) = 0^n + ((n-9)/9)*(1-10^n). 3
 1, 8, 77, 666, 5555, 44444, 333333, 2222222, 11111111, 0, -1111111111, -22222222222, -333333333333, -4444444444444, -55555555555555, -666666666666666, -7777777777777777, -88888888888888888, -999999999999999999, -11111111111111111110, -122222222222222222221 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..20. Index entries for linear recurrences with constant coefficients, signature (22,-141,220,-100). FORMULA a(n) = P(n, n+1, -10) where P(n, m, z) = Product_{k=0..n-1} (z - Sum_{j=1..m} w(n)^(j*k)), where w(n) = e^(2*Pi*i/n), i = sqrt(-1). CROSSREFS Sequence in context: A232087 A105429 A225348 * A091691 A024103 A187638 Adjacent sequences: A091683 A091684 A091685 * A091687 A091688 A091689 KEYWORD sign AUTHOR Paul Barry, Jan 29 2004 STATUS approved

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Last modified June 24 19:44 EDT 2024. Contains 373690 sequences. (Running on oeis4.)