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Search: id:A124953
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| A124953 |
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Number of base 25 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 25, 119, 445, 1947, 8575, 38747, 177223, 819187, 3816247, 17891349, 84312583, 399037959, 1895486995, 9032061297, 43155077395, 206685100995, 991968231607, 4769763119885, 22973188788967, 110815066535017, 535263089155897
(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)+A005191(n+1) for base>=2.int(n/2)+1
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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>2)+($[(i+1)mod N]`-$[i]`>2))
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CROSSREFS
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Sequence in context: A044657 A050589 A020152 this_sequence A126412 A078815 A036057
Adjacent sequences: A124950 A124951 A124952 this_sequence A124954 A124955 A124956
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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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