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 A238559 #20 May 29 2017 21:12:47 %S A238559 1,3,1,1,3,2,1,6,4,1,6,6,1,9,17,5,1,1,9,32,18,4,1,12,56,46,13,1,12,84, %T A238559 90,31,1,15,121,193,98,13,1,1,15,162,360,275,66,6,1,18,212,664,672, %U A238559 250,31,1,18,266,1080,1408,672,110,1,21,329,1711,2797,1772,432,23,1 %N A238559 Number T(n,k) of equivalence classes of ways of placing k 4 X 4 tiles in an n X 8 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=4, 0<=k<=2*floor(n/4), read by rows. %H A238559 Andrew Howroyd, <a href="/A238559/b238559.txt">Table of n, a(n) for n = 4..992</a> %H A238559 Christopher Hunt Gribble, <a href="/A238009/a238009_1.cpp.txt">C++ program</a> %e A238559 The first 11 rows of T(n,k) are: %e A238559 .\ k 0 1 2 3 4 5 6 %e A238559 n %e A238559 4 1 3 1 %e A238559 5 1 3 2 %e A238559 6 1 6 4 %e A238559 7 1 6 6 %e A238559 8 1 9 17 5 1 %e A238559 9 1 9 32 18 4 %e A238559 10 1 12 56 46 13 %e A238559 11 1 12 84 90 31 %e A238559 12 1 15 121 193 98 13 1 %e A238559 13 1 15 162 360 275 66 6 %e A238559 14 1 18 212 664 672 250 31 %o A238559 (C++) See Gribble link. %Y A238559 Cf. A034851, A226048, A102541, A226290, A238009, A228570, A225812, A238189, A238190, A228572, A228022, A231145, A231473, A231568, A232440, A228165, A238550-A238552, A228166, A238555, A238556, A228167, A238557, A238558, A228168, A238581-A238583, A228169, A238586, A238592. %K A238559 tabf,nonn %O A238559 4,2 %A A238559 _Christopher Hunt Gribble_, Feb 28 2014 %E A238559 Terms corrected and xrefs updated by _Christopher Hunt Gribble_, Apr 27 2015 %E A238559 Terms a(31) and beyond from _Andrew Howroyd_, May 29 2017