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 A258471 #7 May 31 2015 17:25:13
%S A258471 1,3,11,41,155,590,2258,8677,33454,129335,501180,1945997,7569223,
%T A258471 29487091,115029830,449288570,1756808604,6876430799,26940317004,
%U A258471 105635470645,414528962220,1627841401281,6396735649200,25152046015693,98955167336425,389526824102747
%N A258471 Number of partitions of 2n into two sorts of parts having exactly n parts of the second sort.
%H A258471 Alois P. Heinz, <a href="/A258471/b258471.txt">Table of n, a(n) for n = 0..300</a>
%F A258471 a(n) = A256193(2n,n).
%F A258471 a(n) ~ c * 4^n / sqrt(Pi*n), where c = 1 / A048651 = 1 / Product_{k>=1} (1-1/2^k) = 3.462746619455... . - _Vaclav Kotesovec_, May 31 2015
%Y A258471 Cf. A256193.
%K A258471 nonn
%O A258471 0,2
%A A258471 _Alois P. Heinz_, May 31 2015