|
Search: id:A126475
|
|
|
| A126475 |
|
Number of base 7 n-digit numbers with adjacent digits differing by three or less. |
|
+0
3
|
|
| 1, 7, 37, 203, 1111, 6083, 33305, 182349, 998383, 5466269, 29928491, 163862147, 897165287, 4912089625, 26894291201, 147249532159, 806209189861, 4414093873755, 24167703582839, 132321131623579, 724474371929041
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
[Empirical] a(base,n)=a(base-1,n)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
|
|
PROGRAM
|
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
|
|
CROSSREFS
|
Cf. Base 7 differing by two or less A126394, one or less A126361.
Sequence in context: A002807 A124610 A002683 this_sequence A077239 A046235 A144496
Adjacent sequences: A126472 A126473 A126474 this_sequence A126476 A126477 A126478
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 27 2006
|
|
|
Search completed in 0.002 seconds
|
