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A229282
Number of ascending runs in {1,...,8}^n.
2
0, 8, 100, 1088, 11008, 106496, 999424, 9175040, 82837504, 738197504, 6509559808, 56908316672, 493921239040, 4260607557632, 36558761623552, 312261302288384, 2656420092706816, 22517998136852480, 190277084256403456, 1603281467343896576, 13474770085092524032
OFFSET
0,2
FORMULA
G.f.: -4*(7*x-2)*x/(8*x-1)^2.
a(n) = 2^(3*n-4)*(9*n+7) for n>0, a(0) = 0.
MAPLE
a:= n-> `if`(n=0, 0, 2^(3*n-4)*(9*n+7)):
seq(a(n), n=0..30);
CROSSREFS
Column k=8 of A229079.
Sequence in context: A083227 A261742 A222486 * A179485 A144072 A261800
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Sep 18 2013
STATUS
approved