1,2

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).

P. J. Nikolai, Permanents of incidence matrices, Math. Comp., 14 (1960), 262-266.

H. J. Ryser, Combinatorial Mathematics. Mathematical Association of America, Carus Mathematical Monograph 14, 1963, p. 124.

Sequence in context: A111429 A111430 A059332 this_sequence A159907 A088912 A055462

Adjacent sequences: A000791 A000792 A000793 this_sequence A000795 A000796 A000797

nonn

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