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A178912 Number of generalized mountain numbers (see A134853) with n digits. 1
9, 0, 240, 1380, 4578, 10794, 19494, 27912, 32195, 30085, 22748, 13820, 6656, 2486, 695, 137, 17, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The total number of generalized mountain numbers is 173247.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

a(18) = 1 because there is exactly one generalized mountain number with 18 digits: 123456789876543210

CROSSREFS

Cf. A134853, A134941, A135417

Sequence in context: A157309 A215484 A177145 * A191564 A067479 A308803

Adjacent sequences:  A178909 A178910 A178911 * A178913 A178914 A178915

KEYWORD

base,nonn,fini,full

AUTHOR

Nathaniel Johnston, Dec 29 2010

STATUS

approved

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Last modified September 27 10:28 EDT 2021. Contains 347689 sequences. (Running on oeis4.)