|
Search: id:A126380
|
|
|
| A126380 |
|
Number of base 26 n-digit numbers with adjacent digits differing by one or less. |
|
+0
5
|
|
| 1, 26, 76, 224, 662, 1960, 5810, 17238, 51180, 152040, 451874, 1343530, 3995984, 11888510, 35378800, 105307232, 313517862, 933569352, 2780376498, 8281841754, 24672375600, 73510750578, 219049521636, 652802078652, 1945651872306
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
[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
|
|
PROGRAM
|
(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
|
Sequence in context: A044545 A139698 A124719 this_sequence A083578 A042326 A042328
Adjacent sequences: A126377 A126378 A126379 this_sequence A126381 A126382 A126383
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 26 2006
|
|
|
Search completed in 0.002 seconds
|
