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A123703
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a(1)=a(2)=1. For n >= 3, a(n) = |(product{k=1 to n-1} a(k)) - (sum{j=1 to n-1} a(j))|.
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1
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1, 1, 1, 2, 3, 2, 2, 12, 264, 75744, 5758891776, 33165272341980979200, 1099935289708766240667530888404210286592, 1209857641546707521062997518664689369471121315619387834957574646785625397657600
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OFFSET
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1,4
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LINKS
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Table of n, a(n) for n=1..14.
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MATHEMATICA
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f[l_List] := Append[l, Abs[Times @@ l - Plus @@ l]]; Nest[f, {1, 1}, 12] (* Ray Chandler, Oct 09 2006 *)
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CROSSREFS
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Cf. A123702.
Sequence in context: A298310 A138680 A171684 * A105436 A266911 A244075
Adjacent sequences: A123700 A123701 A123702 * A123704 A123705 A123706
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KEYWORD
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easy,nonn
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AUTHOR
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Leroy Quet, Oct 08 2006
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EXTENSIONS
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Extended by Ray Chandler, Oct 09 2006
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STATUS
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approved
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