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 A221843 #19 Dec 24 2022 22:24:57
%S A221843 1,1,2,5,10,27,56,141,309,742,1558,3808
%N A221843 Number of partitions of n^2 into squares providing prime dissections of an n X n square into integer-sided squares.
%C A221843 In a prime dissection the GCD of the square sides is one.
%e A221843 For n = 4 the a(4) = 5 sets of squares which provide prime dissections of a 4 X 4 square are {1(3 X 3), 7(1 X 1)}, {3(2 X 2), 4(1 X 1)}, {2(2 X 2), 8(1 X 1)}, {1(2 X 2), 12(1 X 1)} and {16(1 X 1)}.
%Y A221843 Cf. A034295, A037444, A221844.
%K A221843 nonn,more
%O A221843 1,3
%A A221843 _Geoffrey H. Morley_, Jan 26 2013
%E A221843 a(7) corrected and a(9)-a(12) from _Alois P. Heinz_, Apr 15 2013