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Search: id:A125480
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| A125480 |
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Number of base 23 circular n-digit numbers with adjacent digits differing by 9 or less. |
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+0
1
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| 1, 23, 347, 4523, 67367, 1025123, 15878429, 248116017, 3896246503, 61346131583, 967268864947, 15262964541419, 240939538785161, 3804277001327215, 60074046273000617, 948699602037511283, 14982525175594682791
(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)+F(9) for base>=9.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
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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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
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CROSSREFS
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Sequence in context: A042016 A025976 A025989 this_sequence A023950 A025973 A022469
Adjacent sequences: A125477 A125478 A125479 this_sequence A125481 A125482 A125483
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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