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Search: id:A126520
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| A126520 |
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Number of base 25 n-digit numbers with adjacent digits differing by four or less. |
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+0
2
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| 1, 25, 205, 1725, 14645, 124977, 1069941, 9179469, 78869491, 678323799, 5838030793, 50269401543, 432996699399, 3730477803939, 32144938184273, 277017865876053, 2387456054541987, 20577155216208681, 177357954676723141
(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 25 differing by three or less A126493, two or less A126412, one or less A126379.
Sequence in context: A017222 A042210 A125362 this_sequence A065939 A077346 A045785
Adjacent sequences: A126517 A126518 A126519 this_sequence A126521 A126522 A126523
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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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