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 A385321 #8 Jul 23 2025 16:13:53 %S A385321 1,5,70,2167,130708,14231289,2664334184,831478035698 %N A385321 Number of 3-dimensional permutation arrays of size n X n X n. %C A385321 3-dim permutation arrays represent possible intersections of 3 flags of subspaces of R^n. %H A385321 Kimmo Eriksson and Svante Linusson, <a href="https://doi.org/10.1006/aama.1999.0693">A combinatorial theory of higher-dimensional permutation arrays</a>, Adv. Appl. Math. 25(2) (2000a), 194-211. See Table 1 (p. 210). %e A385321 For n=2, the three flags must agree on the two dimensional part. The one-dimensional part either agrees or disagrees which give five possibilities corresponding to the five set partitions of three elements. %Y A385321 Column 3 of A330490. %K A385321 nonn,more %O A385321 1,2 %A A385321 _Svante Linusson_, Jun 25 2025