|
|
A125330
|
|
Number of base 20 circular n-digit numbers with adjacent digits differing by 3 or less.
|
|
0
|
|
|
1, 20, 128, 656, 3928, 23840, 148304, 934968, 5958552, 38285216, 247607348, 1609914524, 10513615792, 68913452056, 453123210178, 2987405569166, 19741419610536, 130718419293680, 867078544410362, 5760352822741182
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
[Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
|
|
LINKS
|
|
|
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
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|