|
Search: id:A126486
|
|
|
| A126486 |
|
Number of base 18 n-digit numbers with adjacent digits differing by three or less. |
|
+0
3
|
|
| 1, 18, 114, 742, 4874, 32186, 213226, 1415510, 9409592, 62605198, 416772336, 2775553058, 18488673878, 123177305178, 820730049614, 5468888194572, 36443213300730, 242854735692378, 1618394841578240, 10785184848010492
(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 18 differing by two or less A126405, one or less A126372.
Sequence in context: A019584 A041622 A125328 this_sequence A061803 A101089 A022678
Adjacent sequences: A126483 A126484 A126485 this_sequence A126487 A126488 A126489
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 27 2006
|
|
|
Search completed in 0.002 seconds
|
