A004274 - OEIS

A004274

0, 2 and the odd numbers.

0, 1, 2, 3, 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

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..67.

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

FORMULA

A004280 UNION {0}. - R. J. Mathar, Oct 28 2008

a(n) = 2*n - 3 + floor(2/n), n > 0. - Wesley Ivan Hurt, May 23 2013

From Chai Wah Wu, Apr 24 2017: (Start)

a(n) = 2*a(n-1) - a(n-2) for n > 4.

G.f.: x*(1 + x^3)/(1 - x)^2. (End)