Number of base 27 circular n-digit numbers with adjacent digits differing by 9 or less.
1, 27, 423, 5607, 85683, 1337727, 21331503, 344238579, 5599424547
1 seqfan posts
Tue Nov 30 20:37:29 CET 2010 [seqfan] Re: Q regarding self-attribution with formulas