A173512 a(n) = 8*n + 4 + n mod 2.

4, 13, 20, 29, 36, 45, 52, 61, 68, 77, 84, 93, 100, 109, 116, 125, 132, 141, 148, 157, 164, 173, 180, 189, 196, 205, 212, 221, 228, 237, 244, 253, 260, 269, 276, 285, 292, 301, 308, 317, 324, 333, 340, 349, 356, 365, 372, 381, 388, 397, 404, 413, 420, 429, 436

Offset

0,1

Comments

First differences of A173511;

a(n+1) - a(n) = A010729(n+1).

Links

Table of n, a(n) for n=0..54.

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

Formula

G.f.: (4 + 9*x + 3*x^2)/((1 + x)*(1 - x)^2). - Philippe Deléham, Nov 29 2016

Mathematica

LinearRecurrence[{1, 1, -1}, {4, 13, 20}, 60] (* Vincenzo Librandi, Nov 29 2016 *)

Prog

(Magma) [8*n+4+n mod 2: n in [0..60]]; // Vincenzo Librandi, Nov 29 2016

Crossrefs

Sequence in context: A298489 A299182 A030744 * A295159 A298216 A299092

Adjacent sequences: A173509 A173510 A173511 * A173513 A173514 A173515

Keyword

nonn

Author

Reinhard Zumkeller, Feb 20 2010

Status

approved