%I
%S 1,2,24,13440,1009008000,19947543780003840,
%T 170891375144777551827763200,942542805268120269309770939139883008000,
%U 4650425326497486529782791149613966242353671284224000000
%N Number of arrangements of 1,2,..,n*n in an n X n matrix such that each row is increasing or decreasing.
%F a(1) = 1 and for n >= 2: a(n) = 2^n * A034841(n) = 2^n * (n^2)! / (n!)^n.
%Y Cf. A034841.
%K nonn
%O 1,2
%A Ahmed Fares (ahmedfares(AT)mydeja.com), Jul 14 2001
%E More terms from _Vladeta Jovovic_, Jul 18 2001
