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Search: id:A141321
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| 1, 1, 10, 5, 42, 14, 60, 15, 110, 22, 5460, 910
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OFFSET
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0,3
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FORMULA
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Note a(2n)/a(2n+1)= 1, 2, 3, 4 = A000027. a(n+1)/a(n)= 2/2, 30/3, 2/4, 42/5, 2/6, 30/7, 2/8, 66/9, 2/10, 2730/11, 2/12 = A027760(n+2)/A000027(n+1)=b(n). Numerators are also (1, 2, 6, 2, 30, 2=A141056)(n+3);A141056 is a version of Bernoulli denominators.
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CROSSREFS
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Sequence in context: A147675 A050136 A070291 this_sequence A146266 A146218 A033962
Adjacent sequences: A141318 A141319 A141320 this_sequence A141322 A141323 A141324
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KEYWORD
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nonn,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Aug 02 2008
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