cp's OEIS Frontend

A238586 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 10 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=5*floor(n/2), read by rows.

%I A238586 #23 May 29 2017 21:10:50
%S A238586 1,5,16,19,9,1,1,5,32,73,66,10,1,10,85,377,961,1348,1080,472,111,12,1,
%T A238586 1,10,142,1011,4429,11370,17252,14478,6094,1020,70,1,15,236,2280,
%U A238586 14203,56571,146212,244063,261847,179063,77974,21422,3637,368,24,1
%N A238586 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 10 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=5*floor(n/2), read by rows.
%H A238586 Andrew Howroyd, <a href="/A238586/b238586.txt">Table of n, a(n) for n = 2..937</a>
%H A238586 Christopher Hunt Gribble, <a href="/A238009/a238009_1.cpp.txt">C++ program</a>
%e A238586 The first 4 rows of T(n,k) are:
%e A238586 .\k  0     1     2     3     4     5     6     7     8     9    10
%e A238586 n
%e A238586 2    1     5    16    19     9     1
%e A238586 3    1     5    32    73    66    10
%e A238586 4    1    10    85   377   961  1348  1080   472   111    12     1
%e A238586 5    1    10   142  1011  4429 11370 17252 14478  6094  1020    70
%o A238586 (C++) See Gribble link.
%Y A238586 Cf. A034851, A226048, A102541, A226290, A238009, A228570, A225812, A238189, A238190, A228572, A228022, A231145, A231473, A231568, A232440, A228165, A238550-A238552, A228166, A238555, A238556, A228167, A238557-A238559, A228168, A238581-A238583, A228169, A238592.
%K A238586 tabf,nonn
%O A238586 2,2
%A A238586 _Christopher Hunt Gribble_, Mar 01 2014
%E A238586 Terms corrected and crossrefs updated by _Christopher Hunt Gribble_, Apr 27 2015
%E A238586 Terms a(36) and beyond from _Andrew Howroyd_, May 29 2017