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 A181205 #13 Sep 23 2019 06:27:14
%S A181205 1,1,9,229,32000,19114420,53786626921,690427159718433,
%T A181205 40891433857372174697,11135886394033736561250816,
%U A181205 13961976233873461322297385441657
%N A181205 Number of n X n matrices containing a permutation of 1..n*n moving each element at most to a neighboring position.
%F A181205 a(n) = A287152(n,n^2).
%e A181205 All solutions for 2X2
%e A181205 ..1..2....1..2....1..4....2..1....2..1....2..4....3..1....3..2....3..4
%e A181205 ..3..4....4..3....3..2....3..4....4..3....1..3....4..2....1..4....1..2
%t A181205 A181206 = Cases[Import["https://oeis.org/A181206/b181206.txt", "Table"], {_, _}][[All, 2]];
%t A181205 a[n_] := A181206[[2 n^2 - 2 n + 1]];
%t A181205 Table[a[n], {n, 1, 10}] (* _Jean-François Alcover_, Sep 23 2019 *)
%Y A181205 Main diagonal of A181206.
%Y A181205 Cf. A287152.
%K A181205 nonn
%O A181205 0,3
%A A181205 _R. H. Hardin_, Oct 10 2010
%E A181205 a(0) and a(10) from _Alois P. Heinz_, May 20 2017