1,2
a(2) = -2 =
|1 2}
|3 4|.
a(3) = 4 =
|.1 2 3|
|.4 5 7|
|8 9 11|.
Cf. A000015, A000961, A119493.
Sequence in context: A009323 A063800 A136147 this_sequence A137933 A115987 A076692
Adjacent sequences: A119507 A119508 A119509 this_sequence A119511 A119512 A119513
easy,sign
Jonathan Vos Post (jvospost2(AT)yahoo.com), May 27 2006
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