A125483 Number of base 26 circular n-digit numbers with adjacent digits differing by 9 or less.

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.

Links

Table of n, a(n) for n=0..16.

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

Adjacent sequences: A125480 A125481 A125482 * A125484 A125485 A125486

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved