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A091693 a(n) = (n*10^n - n + 9)/9. 0
1, 2, 23, 334, 4445, 55556, 666667, 7777778, 88888889, 1000000000, 11111111111, 122222222222, 1333333333333, 14444444444444, 155555555555555, 1666666666666666, 17777777777777777, 188888888888888888 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
G.f.: ( 1-20*x+120*x^2-110*x^3 ) / ( (10*x-1)^2*(x-1)^2 ). - R. J. Mathar, Feb 14 2015
a(n) = 22*a(n-1) - 141*a(n-2) + 220*a(n-3) - 100*a(n-4). - Wesley Ivan Hurt, May 17 2023
CROSSREFS
Cf. A091686.
Sequence in context: A077203 A173935 A216549 * A276025 A211925 A277830
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jan 29 2004
STATUS
approved

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Last modified March 28 15:28 EDT 2024. Contains 371254 sequences. (Running on oeis4.)