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 A089477 #14 Oct 04 2024 09:24:45
%S A089477 2,3,5,13,27,119,737,5153
%N A089477 Smallest positive integer not the permanent of a real {0,1}-matrix of order n.
%C A089477 a(6) from _Gordon F. Royle_.
%H A089477 Swee Hong Chan and Igor Pak, <a href="https://arxiv.org/abs/2308.10214">Computational complexity of counting coincidences</a>, arXiv:2308.10214 [math.CO], 2023. See p. 4.
%e A089477 a(2)=3 because {0,1,2} are expressible as permanents of (0, 1)-matrices.
%Y A089477 Cf. A089479 occurrence counts for permanents of (0, 1)-matrices, A087983 number of different values taken by permanent of (0, 1)-matrix, A013588 smallest number not expressible as determinant of (0, 1)-matrix.
%K A089477 hard,more,nonn
%O A089477 1,1
%A A089477 _Hugo Pfoertner_, Nov 05 2003
%E A089477 a(7) from _Giovanni Resta_, Mar 29 2006
%E A089477 a(8) from _Minfeng Wang_, Oct 04 2024