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Search: id:A126526
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| A126526 |
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Number of base 31 n-digit numbers with adjacent digits differing by four or less. |
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+0
2
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| 1, 31, 259, 2211, 19019, 164343, 1424235, 12368115, 107567215, 936593437, 8162112673, 71178552195, 621048996119, 5421039243545, 47334756754423, 413416811445643, 3611458265770503, 31553302705135081, 275714829055325817
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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[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
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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))
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CROSSREFS
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Cf. Base 31 differing by three or less A126499, two or less A126418, one or less A126385.
Sequence in context: A142623 A089705 A125368 this_sequence A008386 A115151 A001298
Adjacent sequences: A126523 A126524 A126525 this_sequence A126527 A126528 A126529
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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