A125400 Number of base 12 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 12, 114, 978, 9326, 90242, 879720, 8596348, 84075398, 822546834, 8048253694, 78751777578, 770593650824, 7540371931312, 73783784770460, 721987009459748, 7064768636705670, 69129997621163354, 676449147398209026

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..18.

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: A080630 A005543 A257287 * A331515 A154237 A006635

Adjacent sequences: A125397 A125398 A125399 * A125401 A125402 A125403

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved