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Table of n, a(n) for n=4..23.
CombOS - Combinatorial Object Server, generate planar graphs
The House of Graphs, Planar graphs
Sequence in context: A150040 A079456 A264761 * A327698 A183757 A181490
Adjacent sequences: A253879 A253880 A253881 * A253883 A253884 A253885
Danny Rorabaugh, Feb 27 2015