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A125358 Number of base 21 circular n-digit numbers with adjacent digits differing by 4 or less. 0
1, 21, 169, 1101, 8369, 64671, 511957, 4108671, 33331889, 272616609, 2244091579, 18568201871, 154285123493, 1286408940149, 10756655080753, 90159207784161, 757192897525073, 6369787770505701, 53659598197631131, 452559057596166759 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1

LINKS

Table of n, a(n) for n=0..19.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))

CROSSREFS

Sequence in context: A105249 A278992 A041848 * A126516 A241219 A185128

Adjacent sequences:  A125355 A125356 A125357 * A125359 A125360 A125361

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified January 24 08:16 EST 2022. Contains 350534 sequences. (Running on oeis4.)