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 A087983 #15 Oct 04 2024 07:40:14
%S A087983 1,2,3,6,16,51,220,1179,7980
%N A087983 Number of different values taken by permanent of n X n (0,1)-matrix.
%H A087983 <a href="/index/Mat#binmat">Index entries for sequences related to binary matrices</a>
%e A087983 For a 4 X 4 matrix the 16 possible permanents and their multiplicieties are:
%e A087983 {{0, 27713}, {1, 13032}, {2, 10800}, {3, 4992}, {4, 4254}, {5, 1440}, {6, 1536}, {7, 576}, {8, 648}, {9, 24}, {10, 288}, {11, 96}, {12, 48}, {14, 72}, {18, 16}, {24, 1}}
%Y A087983 Cf. A089477, A089479, A089472.
%K A087983 nonn,more
%O A087983 0,2
%A A087983 _Wouter Meeussen_, Oct 29 2003
%E A087983 a(6)=220 from _Gordon F. Royle_, Nov 05 2003
%E A087983 a(7) from _Giovanni Resta_, Mar 29 2006
%E A087983 a(0)=1 prepended by _Alois P. Heinz_, Apr 28 2020
%E A087983 a(8) from _Minfeng Wang_, Oct 04 2024