A136320 Terms of A047241 swapped in pairs.

3, 1, 9, 7, 15, 13, 21, 19, 27, 25, 33, 31, 39, 37, 45, 43, 51, 49, 57, 55, 63, 61, 69, 67, 75, 73, 81, 79, 87, 85, 93, 91, 99, 97, 105, 103, 111, 109, 117, 115, 123, 121, 129, 127, 135, 133, 141, 139, 147, 145, 153, 151, 159, 157, 165, 163, 171, 169, 177, 175, 183

Offset

0,1

Links

Table of n, a(n) for n=0..60.

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

Formula

a(n) = 6*n - a(n-1) - 2 (with a(0)=3). - Vincenzo Librandi, Nov 24 2010

From Chai Wah Wu, Jul 28 2020: (Start)

a(n) = a(n-1) + a(n-2) - a(n-3) for n > 2.

G.f.: (5*x^2 - 2*x + 3)/((x - 1)^2*(x + 1)). (End)

Crossrefs

Sequence in context: A245789 A210395 A019770 * A201840 A114195 A185948

Adjacent sequences: A136317 A136318 A136319 * A136321 A136322 A136323

Keyword

nonn,easy

Author

Paul Curtz, Mar 25 2008

Status

approved