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Search: id:A126409
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| A126409 |
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Number of base 22 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 22, 104, 500, 2418, 11736, 57098, 278274, 1357980, 6633780, 32433110, 158676010, 776746680, 3804116478, 18638153276, 91348350296, 447842953212, 2196139279248, 10771787471680, 52844083573174, 259283266049208
(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 22 differing by one or less A126376.
Sequence in context: A095265 A066450 A124950 this_sequence A041938 A084013 A083123
Adjacent sequences: A126406 A126407 A126408 this_sequence A126410 A126411 A126412
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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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