A135417 Number of mountain numbers (see A134941) with n digits.

1, 0, 8, 56, 252, 784, 1792, 3108, 4166, 4352, 3544, 2232, 1068, 376, 92, 14, 1

Offset: 1

Author

Suggested by Jonathan Vos Post, Nov 24 2007 and computed by Hans Havermann and Joshua Zucker, Nov 25 2007

Keywords

• base
• nonn
• fini
• full

Comments

The total number is 21846.

Examples

			Contribution from _Reinhard Zumkeller_, May 25 2010: (Start)
a(1) = A178334(9) = 1;
a(2) = A178334(99) - A178334(9) = 1 - 1 = 0;
a(3) = A178334(999) - A178334(99) = 9 - 1 = 8;
a(4) = A178334(9999) - A178334(999) = 65 - 9 = 56. (End)