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 A000794 M2143 N2248 #39 Apr 30 2025 16:21:01 %S A000794 1,2,24,3852,18534400,4598378639550 %N A000794 Permanent of projective plane of order n. %D A000794 H. J. Ryser, Combinatorial Mathematics. Mathematical Association of America, Carus Mathematical Monograph 14, 1963, p. 124. %D A000794 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A000794 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A000794 Shamil Asgarli, Brian Freidin, <a href="https://arxiv.org/abs/2009.13421">On the proportion of transverse-free plane curves</a>, arXiv:2009.13421 [math.AG], 2020. %H A000794 Zeynelabidin Karakaş, <a href="https://hdl.handle.net/11511/105942">Classification of Distinct Maximal Flag Codes of a Prescriped Type and Related Results</a>, PhD Thesis, Middle East Technical University, 2023. See pages 40 and 43. %H A000794 Georg Muntingh, <a href="/A000794/a000794.txt">Sage code for constructing the incidence matrix of the projective plane over a finite field of order n, and its permanent.</a> %H A000794 Georg Muntingh, <a href="/A000794/a000794_2.txt">Incidence matrix of a projective plane over a finite field of order 2, 3, 4, 5, 7, 8, and 9</a>. %H A000794 P. J. Nikolai, <a href="http://dx.doi.org/10.1090/S0025-5718-1960-0114764-0">Permanents of incidence matrices</a>, Math. Comp., 14 (1960), 262-266. %e A000794 From _Georg Muntingh_, Feb 03 2014: (Start) %e A000794 The projective plane over a finite field of order 2 has 7 points and 7 lines, for instance meeting with the incidence matrix %e A000794 [1 0 0 1 1 0 0] %e A000794 [0 1 1 0 1 0 0] %e A000794 [1 0 1 0 0 1 0] %e A000794 [0 1 0 1 0 1 0] %e A000794 [0 0 1 1 0 0 1] %e A000794 [1 1 0 0 0 0 1] %e A000794 [0 0 0 0 1 1 1] %e A000794 which has permanent 24. (End) %K A000794 nonn,more %O A000794 1,2 %A A000794 _N. J. A. Sloane_ %E A000794 a(6) from _Georg Muntingh_, Feb 03 2014