0,3

Number of perfect Skolem-type sequences.

G. Nordh, Perfect Skolem sequences

a(3)=5 since the 5 pairings of {1, 2, 3, 4, 5, 6} are: {1, 3} {2, 6} {4, 5}, {1, 5} {2, 3} {4, 6}, {1, 5} {2, 4} {3, 6}, {1, 4} {2, 6} {3, 5}, {1, 6} {2, 5} {3, 4}

Sequence in context: A034332 A146053 A163082 this_sequence A107002 A027864 A065541

Adjacent sequences: A060960 A060961 A060962 this_sequence A060964 A060965 A060966

nonn

Erich Friedman (efriedma(AT)stetson.edu), May 08 2001