0,2
Studied by M. Bhargava (bhargava(AT)math.Princeton.EDU) and H. S. Wilf.
T. D. Noe, Table of n, a(n) for n=0..100
Cf. A047991.
Adjacent sequences: A047987 A047988 A047989 this_sequence A047991 A047992 A047993
Sequence in context: A038055 A006385 A131180 this_sequence A000939 A109154 A030853
nonn,easy,nice
njas
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