2,3

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

M. L. Stein and P. R. Stein, Enumeration of Linear Graphs and Connected Linear Graphs up to $p = 18$ Points. Report LA-3775, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Oct 1967.

Largest entries in the rows of the table in A054924.

Sequence in context: A066305 A020093 A111542 this_sequence A067549 A042933 A005203

Adjacent sequences: A001434 A001435 A001436 this_sequence A001438 A001439 A001440

nonn,nice

N. J. A. Sloane (njas(AT)research.att.com).