The On-Line Encyclopedia of Integer Sequences (OEIS)

A125474 revision #7

A125474

Number of base 17 circular n-digit numbers with adjacent digits differing by 9 or less.

1, 17, 233, 2897, 39897, 556757, 7818749, 110011877, 1548942297, 21813695351, 307225177353, 4327088149379, 60945065497509, 858386080729805, 12090025897059343, 170283256501541477, 2398372933663761385

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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: A358712 A206354 A119273 * A264455 A142126 A251769

Adjacent sequences: A125471 A125472 A125473 * A125475 A125476 A125477

KEYWORD

nonn,base

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006

STATUS

approved