1,1
Cf. A156004, A156005, A156007, A156009, A156010
Sequence in context: A156005 A106122 A106123 this_sequence A155774 A104480 A053746
Adjacent sequences: A156008 A156009 A156010 this_sequence A156012 A156013 A156014
nonn
Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Feb 01 2009
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