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 A126526 Number of base 31 n-digit numbers with adjacent digits differing by four or less. 1
 1, 31, 259, 2211, 19019, 164343, 1424235, 12368115, 107567215, 936593437, 8162112673, 71178552195, 621048996119, 5421039243545, 47334756754423, 413416811445643, 3611458265770503, 31553302705135081, 275714829055325817 (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 31 differing by three or less A126499, two or less A126418, one or less A126385. Sequence in context: A089705 A180471 A125368 * A008386 A161558 A336279 Adjacent sequences:  A126523 A126524 A126525 * A126527 A126528 A126529 KEYWORD nonn,base AUTHOR R. H. Hardin, Dec 28 2006 STATUS approved

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Last modified January 21 03:16 EST 2021. Contains 340332 sequences. (Running on oeis4.)