1,3
a(3) = -4 =
|.1..1..2|
|.3..5..7|
|11.15.22|.
Cf. A000041, A119493.
Sequence in context: A000841 A059918 A002677 this_sequence A074991 A068169 A069631
Adjacent sequences: A119524 A119525 A119526 this_sequence A119528 A119529 A119530
easy,sign
Jonathan Vos Post (jvospost3(AT)gmail.com), May 27 2006
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