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A125483
Number of base 26 circular n-digit numbers with adjacent digits differing by 9 or less.
0
1, 26, 404, 5336, 81104, 1259576, 19967936, 320169512, 5171292032, 83900196944, 1364972167264, 22244133830384, 362871115920320, 5923247233768800, 96723397586353984, 1579802606359113536, 25806819552006704128
OFFSET
0,2
COMMENTS
[Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
CROSSREFS
Sequence in context: A232334 A020924 A022750 * A229025 A357889 A197087
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved