A091692 (10^n-1) * (n+9) / 9.

0, 10, 121, 1332, 14443, 155554, 1666665, 17777776, 188888887, 1999999998, 21111111109, 222222222220, 2333333333331, 24444444444442, 255555555555553, 2666666666666664, 27777777777777775, 288888888888888886

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Index entries for linear recurrences with constant coefficients, signature (22,-141,220,-100).

Formula

G.f.: x*(10-99*x+80*x^2) / ( (10*x-1)^2*(x-1)^2 ). - R. J. Mathar, Feb 14 2015

Mathematica

LinearRecurrence[{22, -141, 220, -100}, {0, 10, 121, 1332}, 20] (* Harvey P. Dale, Mar 02 2017 *)

Crossrefs

Cf. A091686.

Sequence in context: A027770 A330847 A202808 * A098309 A056116 A246643

Adjacent sequences: A091689 A091690 A091691 * A091693 A091694 A091695

Keyword

easy,nonn

Author

Paul Barry, Jan 29 2004

Status

approved