A178912 - OEIS

%I #5 Mar 31 2012 13:22:29

%S 9,0,240,1380,4578,10794,19494,27912,32195,30085,22748,13820,6656,

%T 2486,695,137,17,1

%N Number of generalized mountain numbers (see A134853) with n digits.

%C The total number of generalized mountain numbers is 173247.

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

%Y Cf. A134853, A134941, A135417

%K base,nonn,fini,full

%O 1,1

%A _Nathaniel Johnston_, Dec 29 2010