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Search: id:A125357
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| A125357 |
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Number of base 20 circular n-digit numbers with adjacent digits differing by 4 or less. |
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+0
1
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| 1, 20, 160, 1040, 7880, 60720, 479296, 3835544, 31025864, 253006376, 2076361620, 17126818652, 141850168856, 1178779027316, 9822495145882, 82032520847910, 686360207228280, 5751457669257720, 48255474860875126, 405286028562477798
(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)+A025014(n+1) for base>=4.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]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))
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CROSSREFS
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Sequence in context: A120693 A120692 A059601 this_sequence A126515 A118676 A067534
Adjacent sequences: A125354 A125355 A125356 this_sequence A125358 A125359 A125360
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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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