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Search: id:A057194
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| A057194 |
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a(1) = 1; a(n+1) = (product_{k=1 to n} a(k)) (sum_{j=1 to n} a(j)). |
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+0
1
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| 1, 1, 2, 8, 192, 626688, 1206883411034112, 2804162815248299020572908137501717168128
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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a(1) = a(2) = 1; a(3) = 2; For n >= 2, a(n+2) = a(n+1)^2 *(a(n+1)/a(n) -a(n) +1).
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EXAMPLE
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a(5) = a(1) *a(2) *a(3) *a(4) *(a(1) +a(2) +a(3) +a(4)) = 1 *1 *2 *8 *(1 +1 +2 +8) =192.
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CROSSREFS
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Adjacent sequences: A057191 A057192 A057193 this_sequence A057195 A057196 A057197
Sequence in context: A028368 A056990 A070235 this_sequence A012539 A012535 A012300
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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), Sep 15 2000
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