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A178334 Number of mountain numbers <= n. 5

%I

%S 0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,

%T 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,

%U 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1

%N Number of mountain numbers <= n.

%C a(n) = SUM(A178333(k): 0<=k<=n);

%C a(n) = 21846 for n >= 12345678987654321.

%H R. Zumkeller, <a href="/A178334/b178334.txt">Table of n, a(n) for n = 0..20000</a>

%Y Cf. A135417.

%K nonn

%O 0,1

%A _Reinhard Zumkeller_, May 25 2010

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Last modified January 22 04:27 EST 2020. Contains 331133 sequences. (Running on oeis4.)