A125415 Number of base 27 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 27, 309, 2883, 31361, 347507, 3942849, 45357283, 527368217, 6180793077, 72890540049, 863812188167, 10276686529385, 122640156381419, 1467200048583879, 17587676571419633, 211163124573990697

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..16.

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: A083813 A086574 A274832 * A119295 A048396 A061181

Adjacent sequences: A125412 A125413 A125414 * A125416 A125417 A125418

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved