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1, 10, 37, 118, 361, 1090, 3277, 9838, 29521, 88570, 265717, 797158, 2391481, 7174450, 21523357, 64570078, 193710241, 581130730, 1743392197, 5230176598, 15690529801, 47071589410, 141214768237, 423644304718, 1270932914161
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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COMMENTS
| Number of moves to solve Type 1 Zig-Zag puzzle.
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REFERENCES
| Richard I. Hess, Compendium of Over 7000 Wire Puzzles, privately printed, 1991.
Richard I. Hess, Analysis of Ring Puzzles, booklet distributed at 13-th International Puzzle Party, Amsterdam, Aug 20 1993.
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FORMULA
| a(n)=3*a(n-1)+7 (with a(2)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 02 2010]
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EXAMPLE
| a(3)=3*1+7=10; a(4)=3*10+7=37; a(5)=3*37+7=118; a(6)=3*118+7=361 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 02 2010]
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MAPLE
| a[1]:=1:for n from 2 to 50 do a[n]:=3^n+a[n-1] od: seq(a[n], n=1..25); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 09 2008
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MATHEMATICA
| Table[(3^n - 7)/2, {n, 2, 30}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 02 2006
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CROSSREFS
| Sequence in context: A047672 A200872 A048480 * A199208 A110528 A137280
Adjacent sequences: A116967 A116968 A116969 * A116971 A116972 A116973
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Apr 01 2006
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