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A125488 Number of base 31 circular n-digit numbers with adjacent digits differing by 9 or less. 0
1, 31, 499, 6691, 103999, 1650331, 26785795, 440527111, 7314819751, 122278421227, 2053842141979, 34613678967855, 584736268675807, 9894571943140955, 167626169017722627, 2842115774310107311 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n

LINKS

Table of n, a(n) for n=0..15.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))

CROSSREFS

Sequence in context: A162737 A010983 A022595 * A319427 A241888 A316457

Adjacent sequences:  A125485 A125486 A125487 * A125489 A125490 A125491

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified May 25 01:25 EDT 2019. Contains 323534 sequences. (Running on oeis4.)