A004276 0, 2, 4 and the odd numbers.

0, 1, 2, 3, 4, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131

Offset

0,3

Links

Table of n, a(n) for n=0..68.

Index entries for linear recurrences with constant coefficients, signature (2, -1).

Formula

G.f.: x(1-x^10)/((1-x)^2(1-x^5)). - Paul Barry, Aug 11 2006

Euler transform of length 10 sequence [ 2, 0, 0, 0, 1, 0, 0, 0, 0, -1]. - Michael Somos, Sep 06 2006

Mathematica

Sort[Join[{0, 2, 4}, Range[1, 201, 2]]] (* Harvey P. Dale, Jan 16 2014 *)

Prog

(PARI) {a(n) = if( n<1, 0, n + (n>5) * (n-5))}; /* Michael Somos, Sep 06 2006 */

Crossrefs

Cf. A004281.

Sequence in context: A026285 A013930 A004281 * A033057 A092755 A032515

Adjacent sequences: A004273 A004274 A004275 * A004277 A004278 A004279

Keyword

easy,nonn

Author

N. J. A. Sloane

Status

approved