|
Search: id:A124947
|
|
|
| A124947 |
|
Number of base 19 circular n-digit numbers with adjacent digits differing by 2 or less. |
|
+0
1
|
|
| 1, 19, 89, 331, 1437, 6289, 28241, 128413, 590197, 2734297, 12749679, 59763613, 281370909, 1329632401, 6303226767, 29963180101, 142776168261, 681776377177, 3261689820791, 15630400760077, 75015245736567, 360509440244557
(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: A027848 A039454 A142089 this_sequence A126406 A160296 A088574
Adjacent sequences: A124944 A124945 A124946 this_sequence A124948 A124949 A124950
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
|
|
|
Search completed in 0.002 seconds
|
