1,5
Cf. A000577, A006534, A030223, A030224.
Adjacent sequences: A030221 A030222 A030223 this_sequence A030225 A030226 A030227
Sequence in context: A073799 A040016 A145519 this_sequence A114624 A091024 A151430
nonn
David W. Wilson (davidwwilson(AT)comcast.net)
More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Sep 24 2002
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