



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
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,1


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

Table of n, a(n) for n=0..57.
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).


FORMULA

G.f.: (23*x)/(1x)^2.  Bruno Berselli, Sep 02 2011
a(n) = 2 a(n1)  a(n2). a(n) = A022958(n).  M. F. Hasler, Apr 18 2015


PROG

(PARI) a(n)=n2


CROSSREFS

Cf. A256958, A001057, A000027, A001477, A023443, A023445, ..., A023482, A022958, ..., A022996.
Sequence in context: A065358 A062329 A022958 * A248157 A290428 A136868
Adjacent sequences: A023441 A023442 A023443 * A023445 A023446 A023447


KEYWORD

sign,easy


AUTHOR

N. J. A. Sloane.


STATUS

approved



