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Search: id:A125355
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| A125355 |
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Number of base 18 circular n-digit numbers with adjacent digits differing by 4 or less. |
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+0
1
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| 1, 18, 142, 918, 6902, 52818, 413974, 3289290, 26413814, 213785910, 1740901972, 14244084664, 116982000962, 963573445450, 7955405806616, 65801903210688, 545060017403430, 4520080784608610, 37517875619404780, 311628272467347236
(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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Adjacent sequences: A125352 A125353 A125354 this_sequence A125356 A125357 A125358
Sequence in context: A087115 A108680 A081074 this_sequence A126513 A127408 A008452
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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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