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 A211368 #9 Jul 13 2012 17:35:42 %S A211368 1,2,7,6,26,127,24,126,746,5167,120,744,5166,41066,368047,720,5160, %T A211368 41064,368046,3669866,40284847,5040,41040,368040,3669864,40284846, %U A211368 482671466,6267305647,40320,367920,3669840,40284840,482671464,6267305646 %N A211368 Array read by antidiagonals: T(m,n) = Sum(1<=i<=m) ( n + 2(i-1) )! %C A211368 Index numbers (compare A055089) of rows of adjacent transpositions. %H A211368 Tilman Piesk, <a href="/A211368/b211368.txt">Table of n, a(n) for n = 1..2016</a> %H A211368 Tilman Piesk, <a href="http://en.wikiversity.org/wiki/Inversion_%28discrete_mathematics%29#arrays2">Arrays of permutations</a> (Wikiversity) %e A211368 T(3,2) = Sum( 1 <= i <= 3 ) [ ( 2 + 2(i-1) )! ] %e A211368 = (2+0)! + (2+2)! + (2+4)! %e A211368 = 2 + 24 + 720 %e A211368 = 746 %Y A211368 Cf. A055089. %K A211368 nonn,tabl %O A211368 1,2 %A A211368 _Tilman Piesk_, Jul 07 2012