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A125409 Number of base 21 circular n-digit numbers with adjacent digits differing by 6 or less. 0
1, 21, 231, 2121, 22547, 244601, 2714271, 30517333, 346395491, 3958011609, 45437784111, 523343937005, 6041702589491, 69860441606457, 808706293207743, 9368913912846221, 108598284502838979, 1259272889680954201 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.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..17.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))

CROSSREFS

Sequence in context: A247615 A010973 A022586 * A161581 A069601 A173347

Adjacent sequences:  A125406 A125407 A125408 * A125410 A125411 A125412

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified October 15 21:06 EDT 2018. Contains 316237 sequences. (Running on oeis4.)