A125341 Number of base 31 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 31, 205, 1063, 6469, 39801, 250945, 1602569, 10342789, 67284109, 440527075, 2899382011, 19166086465, 127164179745, 846390009243, 5648944475703, 37792538921349, 253375101591149, 1701917024018695, 11450987830940417

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

Links

Table of n, a(n) for n=0..19.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))

Crossrefs

Sequence in context: A142654 A137657 A228220 * A126499 A297758 A184058

Adjacent sequences: A125338 A125339 A125340 * A125342 A125343 A125344

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved