|
|
A126385
|
|
Number of base 31 n-digit numbers with adjacent digits differing by one or less.
|
|
5
|
|
|
1, 31, 91, 269, 797, 2365, 7025, 20883, 62115, 184845, 550289, 1638775, 4881719, 14545715, 43350415, 129222077, 385262397, 1148802957, 3426077313, 10218944199, 30483682935, 90944672583, 271351287651, 809707376697
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
[Empirical] a(base,n)=a(base-1,n)+3^(n-1) for base>=n; a(base,n)=a(base-1,n)+3^(n-1)-2 when base=n-1
|
|
LINKS
|
|
|
PROG
|
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>1)+($[i+1]`-$[i]`>1))
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|