1,6
Keith M. Briggs, Combinatorial Graph Theory
A diagonal of triangle in A126744.
Adjacent sequences: A126744 A126745 A126746 this_sequence A126748 A126749 A126750
Sequence in context: A073565 A039657 A114473 this_sequence A107668 A158887 A126452
nonn
N. J. A. Sloane (njas(AT)research.att.com), Feb 18 2007
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