A124948 Number of base 20 circular n-digit numbers with adjacent digits differing by 2 or less.

1, 20, 94, 350, 1522, 6670, 29992, 136548, 628362, 2914622, 13606624, 63855108, 300982084, 1423941500, 6758032522, 32161829650, 153427657050, 733475019582, 3513035370640, 16854198764892, 80981882536292, 389635048394172

Offset: 0

Author

R. H. Hardin, Dec 28 2006

Keywords

• nonn
• base

Comments

[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1.

See A285280 for confirmation of linear recurrence and code to produce sequence. - Ray Chandler, Aug 12 2023.

Links

• Ray Chandler, Table of n, a(n) for n = 0..99
• OEIS Wiki, Number of base k circular n-digit numbers with adjacent digits differing by d or less
• Index entries for linear recurrences with constant coefficients, signature (20, -153, 510, -324, -2336, 4689, 2886, -12910, 616, 16708, -3968, -11524, 3200, 4214, -1060, -745, 140, 50, -4, -1).

Crossrefs

Cf. Row 20 of A285280.