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 A126523 Number of base 28 n-digit numbers with adjacent digits differing by four or less. 1
 1, 28, 232, 1968, 16832, 144660, 1247088, 10773792, 93218308, 807453712, 6999891340, 60719731236, 526944732908, 4574529170580, 39722471511860, 344990169778032, 2996656884892004, 26032251950698948, 226161890813945336 (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 28 differing by three or less A126496, two or less A126415, one or less A126382. Sequence in context: A135180 A042524 A125365 * A115224 A135497 A138405 Adjacent sequences: A126520 A126521 A126522 * A126524 A126525 A126526 KEYWORD nonn,base AUTHOR R. H. Hardin, Dec 28 2006 STATUS approved

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Last modified December 11 02:45 EST 2023. Contains 367717 sequences. (Running on oeis4.)