A125331 Number of base 21 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 21, 135, 693, 4159, 25291, 157635, 995659, 6357119, 40921479, 265145505, 1727138841, 11300204035, 74208972755, 488874737353, 3229363648333, 21382430152111, 141869013922279, 942972599847861, 6277675948529895

Offset: 0

Author

R. H. Hardin, Dec 28 2006

Keywords

• nonn
• base

Comments

[Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

Links

• OEIS Wiki, Number of base k circular n-digit numbers with adjacent digits differing by d or less