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Search: id:A125388
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| A125388 |
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Number of base 25 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 25, 245, 1945, 18025, 169975, 1641629, 16074699, 159107841, 1587693061, 15944909855, 160952971853, 1631461695001, 16593111357549, 169235353884807, 1730038601905255, 17719417102045601, 181773198890744037
(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(5) for base>=5.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]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))
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CROSSREFS
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Adjacent sequences: A125385 A125386 A125387 this_sequence A125389 A125390 A125391
Sequence in context: A088890 A108178 A107943 this_sequence A126546 A023073 A022685
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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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