A125479 - OEIS

A125479

Number of base 22 circular n-digit numbers with adjacent digits differing by 9 or less.

1, 22, 328, 4252, 62788, 946972, 14517082, 224253702, 3478257820, 54059966464, 841094239878, 13093151507282, 203873447467294, 3174946219127354, 49447242369205904, 770128096546157332, 11994759635204143948

(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: A025963 A020343 A025941 * A047868 A002539 A230965

Adjacent sequences: A125476 A125477 A125478 * A125480 A125481 A125482

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved