|
Search: id:A126402
|
|
|
| A126402 |
|
Number of base 15 n-digit numbers with adjacent digits differing by two or less. |
|
+0
4
|
|
| 1, 15, 69, 325, 1543, 7361, 35223, 168899, 811105, 3899407, 18761375, 90319881, 434998065, 2095690739, 10098729091, 48672013183, 234609419433, 1130969299775, 5452365150693, 26286944474683, 126739125460983
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
[Empirical] a(base,n)=a(base-1,n)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2
|
|
PROGRAM
|
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>2)+($[i+1]`-$[i]`>2))
|
|
CROSSREFS
|
Cf. Base 15 differing by one or less A126369.
Sequence in context: A015876 A085474 A124893 this_sequence A053134 A000475 A145053
Adjacent sequences: A126399 A126400 A126401 this_sequence A126403 A126404 A126405
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
|
|
|
Search completed in 0.002 seconds
|
