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A125376
Number of base 13 circular n-digit numbers with adjacent digits differing by 5 or less.
0
1, 13, 113, 853, 7333, 64363, 574739, 5174497, 46797333, 424220677, 3850319843, 34968769519, 317694077779, 2886778840153, 26233562935679, 238408390689523, 2166688400848533, 19691415248239135, 178961780093458481
OFFSET
0,2
COMMENTS
[Empirical] a(base,n) = a(base-1,n)+F(5) for base>=5.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n.
PROG
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))
CROSSREFS
Sequence in context: A211846 A196862 A021076 * A048545 A164609 A055430
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved