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 A278838 #5 Nov 29 2016 06:43:39
%S A278838 1,2,1,-2,2,3,0,-3,-1,4,-3,-3,2,-1,-12,12,11,6,-5,0,5,-4,-9,-11,1,4,
%T A278838 -20,-20,-4,9,-18,-27,8,52,-73,83,245,88,-60,-217,-157,74,-30,-99,57,
%U A278838 74,-29,-36,101,320,-205,-206,125,-109,-27,139,-203,-644,-629,723
%N A278838 a(n) = det M_n where M_n is the n X n matrix m(i,j) = A000041(i+j).
%H A278838 Vaclav Kotesovec, <a href="/A278838/b278838.txt">Table of n, a(n) for n = 0..500</a>
%t A278838 Flatten[{1, Table[Det[Table[PartitionsP[i+j], {i, n}, {j, n}]], {n, 1, 100}]}]
%Y A278838 Cf. A000041, A005249, A071543, A204249, A278839, A278840.
%K A278838 sign
%O A278838 0,2
%A A278838 _Vaclav Kotesovec_, Nov 29 2016