cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A199029 a(n) = 9*11^n - 1.

Original entry on oeis.org

8, 98, 1088, 11978, 131768, 1449458, 15944048, 175384538, 1929229928, 21221529218, 233436821408, 2567805035498, 28245855390488, 310704409295378, 3417748502249168, 37595233524740858, 413547568772149448, 4549023256493643938, 50039255821430083328, 550431814035730916618
Offset: 0

Views

Author

Vincenzo Librandi, Nov 03 2011

Keywords

Crossrefs

Programs

  • Magma
    [9*11^n-1: n in [0..20]];

Formula

a(n) = 11*a(n-1) + 10.
a(n) = 12*a(n-1) - 11*a(n-2).
From Bruno Berselli, Nov 03 2011: (Start)
G.f.: 2*(4+x)/((1-x)*(1-11*x)).
a(n) = 2*A199028(n). (End)
From Elmo R. Oliveira, May 07 2025: (Start)
E.g.f.: exp(x)*(9*exp(10*x) - 1).
a(n) = A199763(n) - 2. (End)