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 A244580 #22 Jan 06 2017 08:29:39 %S A244580 1,2,2,3,2,3,4,3,3,4,5,4,4,4,5,6,5,4,4,5,6,7,6,5,6,5,6,7,8,7,6,6,6,6, %T A244580 7,8,9,8,7,6,6,6,7,8,9,10,9,8,7,8,8,7,8,9,10,11,10,9,8,8,8,8,8,9,10, %U A244580 11,12,11,10,9,8,9,9,8,9,10,11,12 %N A244580 Square array read by antidiagonals related to the symmetric representation of sigma. %C A244580 The number of parts k in the square array is equal to A000203(k) hence the sum of parts k is equal to A064987(k). %C A244580 The structure has a three-dimensional representation using polycubes. T(n,k) is the height of a column. The total area in the horizontal level z gives A000203(z). %C A244580 The main diagonal gives A244367. %e A244580 . _ _ _ _ _ _ _ _ _ %e A244580 1,2,3,4,5,6,7,8,9... |_| | | | | | | | | %e A244580 2,2,3,4,5,6,7,8,9... |_ _|_| | | | | | | %e A244580 3,3,4,4,5,6,7,8,9... |_ _| _|_| | | | | %e A244580 4,4,4,6,6,6,7,8,9... |_ _ _| _|_| | | %e A244580 5,5,5,6,6,8,8,8,9... |_ _ _| _| _ _|_| %e A244580 6,6,6,6,8,8,9... |_ _ _ _| _| | %e A244580 7,7,7,7,8,9,9... |_ _ _ _| |_ _| %e A244580 8,8,8,8,8... |_ _ _ _ _| %e A244580 9,9,9,9,9... |_ _ _ _ _| %e A244580 . %Y A244580 Cf. A000203, A064987, A143128, A185283, A196020, A236104, A235791, A237270, A237271, A237591, A237593, A071562, A244367. %K A244580 nonn,tabl %O A244580 1,2 %A A244580 _Omar E. Pol_, Jul 04 2014