A023444 a(n) = n-2.

-2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55

Offset: 0

Author

N. J. A. Sloane

Keywords

• sign
• easy

Comments

The months September to December (9 to 12) are sometimes found in old written French to be abbreviated as 7bre, 8bre, 9bre and 10bre. See Jeff Steiner link. - Michel Marcus, Sep 26 2017

Links

• Tanya Khovanova, Recursive Sequences
• Jeff Steiner's Americans in France, Abbreviated Months (7bre, 8bre, 9bre, 10bre and Xbre)
• Robert G. Wilson v, American English names for the numbers from 0 to 100999 without spaces or hyphens.
• Index entries for linear recurrences with constant coefficients, signature (2,-1).

Crossrefs

Cf. A256958, A001057, A000027, A001477, A023443, A023445, ..., A023482, A022958, ..., A022996.

Programs

Mathematica

Range[-2, 100] (* Wesley Ivan Hurt, Sep 10 2023 *)

PARI

a(n)=n-2

Formula

G.f.: -(2-3*x)/(1-x)^2. - Bruno Berselli, Sep 02 2011

a(n) = 2*a(n-1) - a(n-2). a(n) = -A022958(n). - M. F. Hasler, Apr 18 2015