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 A322058 #16 Dec 27 2018 22:12:10 %S A322058 1,1,1,1,1,2,2,1,1,2,5,6,5,3,1,1,2,5,10,16,20,20,15,9,4,1,1,2,5,10,20, %T A322058 32,51,67,79,80,68,49,29,14,5,1,1,2,5,10,20,36,61,96,148,208,268,321, %U A322058 351,347,308,241,165,98,49,20,6,1,1,2,5,10,20,36,65,106,171,262,397,568,784,1019,1264,1478,1628,1681,1619,1441,1173,866,574,338,174,76,27,7,1 %N A322058 Irregular triangle read by rows: T(n,k) = number of 1324-avoiding permutations of length n >= 0 having k >= 0 inversions. %D A322058 Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, page 769, Fig. 12.13. %e A322058 Triangle begins: %e A322058 1; %e A322058 1; %e A322058 1, 1; %e A322058 1, 2, 2, 1; %e A322058 1, 2, 5, 6, 5, 3, 1; %e A322058 1, 2, 5, 10, 16, 20, 20, 15, 9, 4, 1; %e A322058 1, 2, 5, 10, 20, 32, 51, 67, 79, 80, 68, 49, 29, 14, 5, 1; %e A322058 ... %Y A322058 The rows appear to be converging to A000712. %Y A322058 Row sums are A061552. %Y A322058 Cf. A188919. %K A322058 nonn,tabf %O A322058 0,6 %A A322058 _N. J. A. Sloane_, Dec 25 2018 %E A322058 More terms from _Alois P. Heinz_, Dec 27 2018