%I #2 Mar 30 2012 17:30:45
%S 1,5,17,38,73,126,199,296,420,576,765,992,1261,1574,1935,2348,2815,
%T 3341,3928,4581,5302,6096,6964,7912,8942,10058,11262,12560,13954,
%U 15447,17042,18745,20557,22482,24524,26686,28971,31383,33926,36602,39416
%N Largest eigenvalue, rounded to the nearest integer, of a rank n matrix of 1..n^2 filled successively along antidiagonals (A069480).
%t f[n_] := Table[(i + j - 1)((i + j - 1) - 1)/2 + 1 + (j - 1) - Mod[i + j - 1, n, 1]^2 Quotient[i + j - 1, n, 1], {i, n}, {j, n}]; Table[ Sort[ Round[ Eigenvalues[ N[ f[n]]]]] [[ -1]], {n, 1, 45}]
%K nonn
%O 1,2
%A _Robert G. Wilson v_, Jul 15 2002