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 A303861 #10 Feb 16 2025 08:33:54 %S A303861 1,2,8,23,70,178,479,1119,2687,5960,13203,27728,58293,117084,234579, %T A303861 455637,878603,1652382,3089769,5654741,10284636,18389288,32649594, %U A303861 57145095,99386432,170658713,291240275,491704106,825049784,1371281674,2266239384,3713251732 %N A303861 Number of pairs (lambda,mu) of partitions lambda of 2n and mu of n with mu <= lambda (by diagram containment). %H A303861 Alois P. Heinz, <a href="/A303861/b303861.txt">Table of n, a(n) for n = 0..100</a> %H A303861 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FerrersDiagram.html">Ferrers Diagram</a> %H A303861 Wikipedia, <a href="https://en.wikipedia.org/wiki/Ferrers_diagram">Ferrers diagram</a> %F A303861 a(n) = A259478(2n,n) = A303851(2n) = A303852(2n). %Y A303861 Bisection (even part) of A303851 and of A303852. %Y A303861 Cf. A259478. %K A303861 nonn %O A303861 0,2 %A A303861 _Alois P. Heinz_, May 01 2018