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A094623 Expansion of x*(1+10*x)/((1-x)*(1-10*x^2)). 3
0, 1, 11, 21, 121, 221, 1221, 2221, 12221, 22221, 122221, 222221, 1222221, 2222221, 12222221, 22222221, 122222221, 222222221, 1222222221, 2222222221, 12222222221, 22222222221, 122222222221, 222222222221, 1222222222221 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Previous name was: Sequence whose n-th term digits sum to n.

n-th term digits are reversals of A094624(n).

LINKS

Table of n, a(n) for n=0..24.

Index entries for linear recurrences with constant coefficients, signature (1,10,-10).

FORMULA

G.f.: x*(1+10*x)/((1-x)*(1-10*x^2)).

a(n) = (10^(n/2)/2)*(11/9 + 2*sqrt(10)/9 - (2*sqrt(10)/9 - 11/9)*(-1)^n) - 11/9.

CROSSREFS

Cf. A094624, A094625, A094626.

Sequence in context: A126299 A166707 A116525 * A321509 A034922 A015446

Adjacent sequences:  A094620 A094621 A094622 * A094624 A094625 A094626

KEYWORD

easy,nonn,base

AUTHOR

Paul Barry, May 15 2004

STATUS

approved

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)