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 A278803 #6 Jun 19 2025 21:36:53 %S A278803 15,154,1439,12958,110455,870473,6275546,41370842,250517485, %T A278803 1402100369,7299678838,35565305995,163045228099,706720556002, %U A278803 2908736101561,11411036414661,42812862296055,154084456853488,533397095123831 %N A278803 Number of n X 4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order. %C A278803 Column 4 of A278807. %H A278803 R. H. Hardin, <a href="/A278803/b278803.txt">Table of n, a(n) for n = 1..210</a> %H A278803 R. H. Hardin, <a href="/A278803/a278803.txt">Empirical polynomial of degree 44</a> %F A278803 Empirical polynomial of degree 44 (see link above). %e A278803 Some solutions for n=4 %e A278803 ..2..1..1..0. .2..1..1..0. .1..1..1..0. .1..1..0..0. .1..0..0..0 %e A278803 ..2..1..1..0. .2..2..1..0. .2..0..0..1. .2..0..0..0. .1..2..2..0 %e A278803 ..2..1..1..0. .2..2..1..2. .2..2..0..1. .2..0..1..1. .2..2..0..0 %e A278803 ..2..2..1..1. .2..2..2..1. .2..2..2..1. .2..2..1..1. .2..2..2..0 %Y A278803 Cf. A278807. %K A278803 nonn %O A278803 1,1 %A A278803 _R. H. Hardin_, Nov 28 2016