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Search: id:A125485
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| A125485 |
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Number of base 28 circular n-digit numbers with adjacent digits differing by 9 or less. |
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+0
1
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| 1, 28, 442, 5878, 90262, 1415878, 22695076, 368310712, 6028038286, 99207708814, 1638704629522, 27132638036202, 449943629944228, 7468996856620028, 124065300876811890, 2061684054575682598, 34269888230469320798
(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: A121803 A022656 A154588 this_sequence A054337 A009685 A007833
Adjacent sequences: A125482 A125483 A125484 this_sequence A125486 A125487 A125488
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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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