|
Search: id:A124951
|
|
|
| A124951 |
|
Number of base 23 circular n-digit numbers with adjacent digits differing by 2 or less. |
|
+0
1
|
|
| 1, 23, 109, 407, 1777, 7813, 35245, 160953, 742857, 3455597, 16177459, 76129593, 359815609, 1706868797, 8122449787, 38757778297, 185382123417, 888570946797, 4267072020187, 20525592779337, 98881792935527, 477011872851207
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1
|
|
PROGRAM
|
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>2)+($[(i+1)mod N]`-$[i]`>2))
|
|
CROSSREFS
|
Sequence in context: A139912 A157607 A142272 this_sequence A126410 A071634 A101804
Adjacent sequences: A124948 A124949 A124950 this_sequence A124952 A124953 A124954
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
|
|
|
Search completed in 0.002 seconds
|
