A125480 Number of base 23 circular n-digit numbers with adjacent digits differing by 9 or less.

1, 23, 347, 4523, 67367, 1025123, 15878429, 248116017, 3896246503, 61346131583, 967268864947, 15262964541419, 240939538785161, 3804277001327215, 60074046273000617, 948699602037511283, 14982525175594682791

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: A042016 A025976 A025989 * A023950 A268465 A025973

Adjacent sequences: A125477 A125478 A125479 * A125481 A125482 A125483

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved