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Search: id:A113844
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| A113844 |
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a(1) =a(2) =1. a(n+1) = (sum{1<=k<=n/2} a(k)) * (sum{n/2<j<=n} a(j)). |
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+0
1
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| 1, 1, 1, 2, 6, 18, 78, 312, 2070, 12420, 163878, 1966536, 62213526, 1866405780, 206591803854, 22311914816232, 9436063264020024, 3963146570888410080, 9887814229774042889370, 24620657432137366794531300
(list; graph; listen)
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OFFSET
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1,4
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EXAMPLE
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a(8) = (a(1)+a(2)+a(3)) * (a(4)+a(5)+a(6)+a(7)) =
(1+1+1) * (2+6+18+78) = 312.
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CROSSREFS
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Sequence in context: A006388 A007116 A079391 this_sequence A007869 A118476 A118455
Adjacent sequences: A113841 A113842 A113843 this_sequence A113845 A113846 A113847
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KEYWORD
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easy,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jan 24 2006
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EXTENSIONS
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More terms from Evonne Haines (avissean(AT)adelphia.net), Jan 28 2006
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