A125382 Number of base 19 circular n-digit numbers with adjacent digits differing by 5 or less.

1, 19, 179, 1399, 12679, 117169, 1108151, 10622169, 102843047, 1002906517, 9832026699, 96763261669, 955021583503, 9445371945561, 93558608546267, 927743558287129, 9207050413918087, 91425186769710909, 908226948062391227

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(5) for base>=5.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]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))

Crossrefs

Sequence in context: A217698 A172642 A133740 * A126540 A008419 A211866

Adjacent sequences: A125379 A125380 A125381 * A125383 A125384 A125385

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved