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 A319325 #11 Sep 28 2018 23:20:21
%S A319325 2,10,52,276,1470,7838,41798,222902,1188696,6339088,33805118,
%T A319325 180276062,961376842,5126833922,27340398612,145800977348,777527983398,
%U A319325 4146404063814,22111958704510,117918733974142,628837454333128,3353466668484240,17883379272566534,95368550166928198
%N A319325 a(n) is the number of row convex polyglasses (polyiamonds which need only touch at corners) with n cells.
%H A319325 Adam Gruber, <a href="https://devweb3000.cis.strath.ac.uk/~xpb16190/LatticeAnimals/LatticeAnimals.jar">Java program to count lattice animals</a>.
%F A319325 G.f.: (2*z*(1+z)*(1-z)^3)/(1-7z+9z^2+z^3-9z^4+3z^5).
%e A319325 The only diglasses that are not row convex are "two mountains" and its 180-degree rotation. So a(2) = A319324(2) - 2 = 10.
%t A319325 Rest@CoefficientList[Series[(2z(1+z)(1-z)^3)/(1-7z+9z^2+z^3-9z^4+3z^5),{z,0,20}],z]
%Y A319325 Cf. A319324 (fixed polyglasses), A319326 (column convex polyglasses), A238823 (row convex polyiamonds).
%K A319325 nonn
%O A319325 1,1
%A A319325 _David Bevan_, Sep 27 2018