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A125384
Number of base 21 circular n-digit numbers with adjacent digits differing by 5 or less.
0
1, 21, 201, 1581, 14461, 134771, 1285977, 12439679, 121597973, 1197833865, 11869436151, 118149605727, 1180196166649, 11820885524937, 118645707961821, 1192758883780301, 12005797667167477, 120960246762028827
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: A239418 A337897 A341399 * A126542 A297906 A298500
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved