A019476 a(n) = 5*a(n-1) + a(n-2) - 2*a(n-3).

2, 10, 51, 261, 1336, 6839, 35009, 179212, 917391, 4696149, 24039712, 123059927, 629947049, 3224715748, 16507405935, 84501851325, 432567231064, 2214323194775, 11335179502289, 58025086244092

Offset

0,1

References

R. K. Guy, personal communication.

Links

Table of n, a(n) for n=0..19.

Formula

O.g.f.: (2-x^2)/(1-5x-x^2+2x^3). [From R. J. Mathar, Aug 22 2008]

Crossrefs

Sequence in context: A128449 A037514 A037717 * A019475 A020042 A353289

Adjacent sequences: A019473 A019474 A019475 * A019477 A019478 A019479

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved