cp's OEIS Frontend

A062716 Number of arrangements of 1,2,..,n*n in an n X n matrix such that each row is increasing or decreasing.

%I A062716 #3 May 10 2013 12:44:48
%S A062716 1,2,24,13440,1009008000,19947543780003840,
%T A062716 170891375144777551827763200,942542805268120269309770939139883008000,
%U A062716 4650425326497486529782791149613966242353671284224000000
%N A062716 Number of arrangements of 1,2,..,n*n in an n X n matrix such that each row is increasing or decreasing.
%F A062716 a(1) = 1 and for n >= 2: a(n) = 2^n * A034841(n) = 2^n * (n^2)! / (n!)^n.
%Y A062716 Cf. A034841.
%K A062716 nonn
%O A062716 1,2
%A A062716 Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 14 2001
%E A062716 More terms from _Vladeta Jovovic_, Jul 18 2001