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A229284
Number of ascending runs in {1,...,10}^n.
2
0, 10, 155, 2100, 26500, 320000, 3750000, 43000000, 485000000, 5400000000, 59500000000, 650000000000, 7050000000000, 76000000000000, 815000000000000, 8700000000000000, 92500000000000000, 980000000000000000, 10350000000000000000, 109000000000000000000
OFFSET
0,2
FORMULA
G.f.: -5*(9*x-2)*x/(10*x-1)^2.
a(n) = 10^(n-1)*(11*n+9)/2 for n>0, a(0) = 0.
MAPLE
a:= n-> `if`(n=0, 0, 10^(n-1)*(11*n+9)/2):
seq(a(n), n=0..30);
CROSSREFS
Column k=10 of A229079.
Sequence in context: A298081 A240374 A261744 * A087603 A292837 A261802
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Sep 18 2013
STATUS
approved