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Search: id:A126412
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| A126412 |
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Number of base 25 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 25, 119, 575, 2793, 13611, 66473, 325149, 1592355, 7805655, 38292485, 187972885, 923231055, 4536538325, 22300261185, 109658861091, 539395083843, 2653895007787, 13060517277349, 64287300999691, 316495856518423
(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)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2
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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]`-$[i+1]`>2)+($[i+1]`-$[i]`>2))
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CROSSREFS
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Cf. Base 25 differing by one or less A126379.
Sequence in context: A050589 A020152 A124953 this_sequence A078815 A036057 A083509
Adjacent sequences: A126409 A126410 A126411 this_sequence A126413 A126414 A126415
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KEYWORD
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nonn,base
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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