A125338 Number of base 28 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 28, 184, 952, 5776, 35448, 222952, 1420496, 9147088, 59375320, 387912604, 2547709060, 16806321736, 111277617648, 739135427676, 4923070227492, 32869506283728, 219923274753560, 1474233675264148, 9898993676048540

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: A341160 A219386 A219632 * A126496 A228742 A222967

Adjacent sequences: A125335 A125336 A125337 * A125339 A125340 A125341

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved