This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A180345 #15 Oct 19 2013 10:36:59
%S A180345 148726593,157836492,175429863,184539762,249715683,267935481,
%T A180345 276418953,294638751,359814672,368924571,386517942,395627841,
%U A180345 418953276,429863175,481267935,492157836,517942386,539762184
%N A180345 Lexicographically ordered 3X3 matrices containing numbers 1..9 with maximal determinant = 412.
%C A180345 The matrices are presented here as 9-digit decimal numbers, one digit per entry in the matrix.
%C A180345 There are exactly 36 such matrices: 148726593, 157836492, 175429863, 184539762, 249715683, 267935481, 276418953, 294638751, 359814672, 368924571, 386517942, 395627841, 418953276, 429863175, 481267935, 492157836, 517942386, 539762184, 571368924, 593148726, 627841395, 638751294, 672359814, 683249715, 715683249, 726593148, 751294638, 762184539, 814672359, 836492157, 841395627, 863175429, 924571368, 935481267, 942386517, 953276418.
%e A180345 148726593 => {{1,4,8},{7,2,6},{5,9,3}}:
%e A180345 1 4 8
%e A180345 7 2 6
%e A180345 5 9 3
%e A180345 1*(2*3-9*6)-4(7*3-5*6)+8*(7*9-5*2)=412.
%Y A180345 Cf. A085000 Maximal determinant of an n X n matrix using the integers 1 to n^2.
%Y A180345 Cf. A088215 (1/36)*number of ways to express n as the determinant of a 3 X 3 matrix with elements 1..9.
%K A180345 nonn,fini,base
%O A180345 1,1
%A A180345 _Zak Seidov_, Jan 18 2011