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 A321772 #11 Jan 06 2019 13:47:56 %S A321772 1,1,1,4,5,6,142,428,1269,3874,20336,114522,429002,1743184,6456192, %T A321772 23749014,93997909,368890906,1122546076,4496925530,17437145160, %U A321772 76147395524,310155556998,1417665712388,5528899930962,21923449788406,82833896451112,347234278501138 %N A321772 Number of compositions of 2n into parts with distinct multiplicities and with exactly n parts. %H A321772 Vaclav Kotesovec, <a href="/A321772/b321772.txt">Table of n, a(n) for n = 0..131</a> (terms 0..100 from Alois P. Heinz) %F A321772 a(n) = A242887(2n,n). %e A321772 a(0) = 1: the empty composition. %e A321772 a(1) = 1: 2. %e A321772 a(2) = 1: 22. %e A321772 a(3) = 4: 222, 114, 141, 411. %Y A321772 Cf. A242887. %K A321772 nonn %O A321772 0,4 %A A321772 _Alois P. Heinz_, Nov 18 2018