A106438 G.f.: x(2-5x-2x^2)/(1-6x+9x^2-x^4).

0, 2, 7, 22, 69, 218, 694, 2224, 7167, 23204, 75415, 245878, 803700, 2632502, 8637127, 28376122, 93326289, 307205138, 1011931354, 3335118004, 10996652127, 36271055864, 119668397395, 394905999598, 1303417073160, 4302619498442

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Formula

(1/2) [Lucas(2n-1) + A006190(n+1) ]. - Ralf Stephan, Jun 02 2007

Mathematica

v[1] = {0, 1, 1, 2}; v[n_] := v[n] = M.v[n - 1]; digits = 50; a = Table[v[n][[1]], {n, 1, digits}]

Crossrefs

Cf. A001906, A006190.

Sequence in context: A292399 A094618 A077833 * A291382 A109999 A092690

Adjacent sequences: A106435 A106436 A106437 * A106439 A106440 A106441

Keyword

nonn

Author

Roger L. Bagula, May 29 2005

Extensions

Edited by the Associate Editors of the OEIS, Apr 09 2009

Status

approved