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A012880
a(n+3) = 5*a(n+2)-4*a(n+1)+a(n).
0
0, 1, 3, 11, 44, 179, 730, 2978, 12149, 49563, 202197, 824882, 3365185, 13728594, 56007112, 228486369, 932131991, 3802721591, 15513566360, 63289077427, 258193843286, 1053326473082, 4297146069693, 17530618299423
OFFSET
0,3
FORMULA
G.f. x*(-1+2*x) / ( -1+5*x-4*x^2+x^3 ). a(n) = A012814(n)-2*A012814(n-1). - R. J. Mathar, Sep 20 2012
CROSSREFS
Cf. A012855.
Sequence in context: A370998 A239392 A122393 * A200613 A149073 A167011
KEYWORD
nonn,easy
AUTHOR
STATUS
approved