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A090019
a(n) = (3*10^n + 2*0^n)/5.
3
1, 6, 60, 600, 6000, 60000, 600000, 6000000, 60000000, 600000000, 6000000000, 60000000000, 600000000000, 6000000000000, 60000000000000, 600000000000000, 6000000000000000, 60000000000000000, 600000000000000000
OFFSET
0,2
COMMENTS
Fifth column of triangle A067410.
FORMULA
G.f.: (1-4x)/(1-10x).
E.g.f.: (3*exp(10x)+2)/5 = exp(5x)(cosh(5x)+sinh(5x)/5).
MATHEMATICA
Join[{1}, NestList[10#&, 6, 20]] (* Harvey P. Dale, Apr 02 2015 *)
CROSSREFS
Sequence in context: A136930 A136936 A136893 * A186676 A322441 A186674
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Nov 20 2003
STATUS
approved