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A126521 Number of base 26 n-digit numbers with adjacent digits differing by four or less. 1
1, 26, 214, 1806, 15374, 131538, 1128990, 9710910, 83652388, 721363974, 6225222156, 53750847042, 464278918952, 4011329573242, 34664086928592, 299591386800116, 2589524785835700, 22384118655449566, 193499832018326518 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4

LINKS

Table of n, a(n) for n=0..18.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))

CROSSREFS

Cf. Base 26 differing by three or less A126494, two or less A126413, one or less A126380.

Sequence in context: A042310 A213123 A125363 * A242262 A241938 A317865

Adjacent sequences:  A126518 A126519 A126520 * A126522 A126523 A126524

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified January 28 06:00 EST 2021. Contains 340490 sequences. (Running on oeis4.)