1,6
Eric Weisstein's World of Mathematics, Critical Nonplanar Graph
Sequence in context: A068774 A068775 A073955 this_sequence A117083 A007987 A092397
Adjacent sequences: A158919 A158920 A158921 this_sequence A158923 A158924 A158925
nonn,more
E. W. Weisstein (eric(AT)weisstein.com), Mar 31, 2009
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