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A081708
a(n) = a(n-1) + 64*a(n-2) starting with a(0) = 2 and a(1) = 1.
1
2, 1, 129, 193, 8449, 20801, 561537, 1892801, 37831169, 158970433, 2580165249, 12754272961, 177884848897, 994158318401, 12378788647809, 76004921025473, 868247394485249, 5732562340115521, 61300395587171457, 428184385354564801, 4351409702933538049
OFFSET
0,1
FORMULA
a(n) = ((1 + sqrt(257))/2)^n + ((1 - sqrt(257))/2)^n.
G.f.: (2-x) / (1-x-64*x^2). - Colin Barker, Feb 22 2016
PROG
(PARI) a(n) = my(w = quadgen(257)); w^n + (1 - w)^n;
(PARI) Vec((2-x)/(1-x-64*x^2) + O(x^30)) \\ Colin Barker, Feb 22 2016
CROSSREFS
Cf. A072265.
Sequence in context: A104025 A335600 A039923 * A358858 A012004 A101923
KEYWORD
nonn,easy
AUTHOR
Helmut Schmiedel (a.positiv(AT)web.de), Apr 03 2003
EXTENSIONS
More terms from Michel Marcus, Aug 24 2013
STATUS
approved