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 A126522 Number of base 27 n-digit numbers with adjacent digits differing by four or less. 1
 1, 27, 223, 1887, 16103, 138099, 1188039, 10242351, 88435341, 764407997, 6612526647, 57234605067, 495599614141, 4292742043159, 37190688714579, 322257543592553, 2792687844075253, 24203507849388273, 209778422093025849 (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 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 27 differing by three or less A126495, two or less A126414, one or less A126381. Sequence in context: A160441 A222994 A125364 * A273822 A027500 A069979 Adjacent sequences:  A126519 A126520 A126521 * A126523 A126524 A126525 KEYWORD nonn,base AUTHOR R. H. Hardin, Dec 28 2006 STATUS approved

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Last modified January 15 18:55 EST 2021. Contains 340188 sequences. (Running on oeis4.)