|
| |
|
|
A053438
|
|
Expansion of (1+x+2*x^3)/((1-x)*(1-x^2)).
|
|
0
| |
|
|
1, 2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31, 34, 35, 38, 39, 42, 43, 46, 47, 50, 51, 54, 55, 58, 59, 62, 63, 66, 67, 70, 71, 74, 75, 78, 79, 82, 83, 86, 87, 90, 91, 94, 95, 98, 99, 102, 103, 106, 107, 110, 111, 114, 115, 118, 119, 122
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).
|
|
|
FORMULA
| a(n) = 2*n -(1+(-1^n))/2 (with a different offset). - Frank Ellermann (hmdmhdfmhdjmzdtjmzdtzktdkztdjz(AT)gmail.com), Feb 12, 2002
a(n)=A042964(n), n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 13 2008]
|
|
|
PROG
| (PARI) a(n)=abs(n\2*4+n%2*3-1) \\ Charles R Greathouse IV, Dec 08 2011
|
|
|
CROSSREFS
| Sequence in context: A073439 A188084 A107998 * A042964 A062837 A190670
Adjacent sequences: A053435 A053436 A053437 * A053439 A053440 A053441
|
|
|
KEYWORD
| nonn,easy
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 12 2000
|
| |
|
|
