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A019476
a(n) = 5*a(n-1) + a(n-2) - 2*a(n-3).
0
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.
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
KEYWORD
nonn
AUTHOR
STATUS
approved