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 A278802 #5 Nov 28 2016 13:32:23 %S A278802 10,63,322,1439,5767,20972,69834,214774,615120,1653047,4196501, %T A278802 10123619,23327383,51572441,109818385,225997932,450803519,873872396, %U A278802 1649976645,3040564120,5478446820,9666837555,16728604905,28427944695,47495149011 %N A278802 Number of nX3 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order. %C A278802 Column 3 of A278807. %H A278802 R. H. Hardin, <a href="/A278802/b278802.txt">Table of n, a(n) for n = 1..210</a> %F A278802 Empirical: a(n) = (1/20922789888000)*n^16 + (1/201180672000)*n^15 + (257/1046139494400)*n^14 + (1/130636800)*n^13 + (19241/114960384000)*n^12 + (3523/1306368000)*n^11 + (241517/7315660800)*n^10 + (284771/914457600)*n^9 + (336468511/146313216000)*n^8 + (35482669/2612736000)*n^7 + (376442771/5748019200)*n^6 + (46737917/179625600)*n^5 + (361669107043/435891456000)*n^4 + (250175041/127008000)*n^3 + (375648041/121080960)*n^2 + (13891/5040)*n + 1 %e A278802 Some solutions for n=4 %e A278802 ..1..1..0. .1..1..0. .1..0..0. .0..0..0. .1..1..0. .2..1..0. .1..0..0 %e A278802 ..2..0..2. .2..1..1. .1..2..0. .0..0..0. .1..1..0. .2..1..0. .1..1..1 %e A278802 ..2..2..0. .2..1..2. .1..2..1. .0..0..0. .1..1..1. .2..1..0. .1..1..1 %e A278802 ..2..2..0. .2..1..2. .2..2..2. .1..0..0. .2..1..0. .2..2..1. .2..2..0 %Y A278802 Cf. A278807. %K A278802 nonn %O A278802 1,1 %A A278802 _R. H. Hardin_, Nov 28 2016