The On-Line Encyclopedia of Integer Sequences (OEIS)

A125470 revision #4

A125470

Number of base 13 circular n-digit numbers with adjacent digits differing by 9 or less.

1, 13, 157, 1813, 21997, 267483, 3255907, 39636855, 482546341, 5874634345, 71519267407, 870693584543, 10600043444419, 129047604857977, 1571058121063511, 19126458200814873, 232850330879455797

(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..16.

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: A360192 A244206 A159499 * A165151 A016125 A353147

Adjacent sequences: A125467 A125468 A125469 * A125471 A125472 A125473

KEYWORD

nonn,new

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Dec 28 2006

STATUS

approved