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 A186907 #10 Jul 22 2025 10:34:36 %S A186907 2066505,59969593,1276581035,22000126445,319741716426,4028133387613, %T A186907 44902749582723,449959668016830,4103914508092780,34409633745323847, %U A186907 267409041699567853,1939370255679423718,13202565796526137619 %N A186907 Number of (n+2)X3 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order. %C A186907 Column 1 of A186915 %H A186907 R. H. Hardin, <a href="/A186907/b186907.txt">Table of n, a(n) for n = 1..200</a> %H A186907 R. H. Hardin, <a href="/A186907/a186907.txt">Polynomial of degree 83</a> %F A186907 Polynomial of degree 83 in n, see link. %e A186907 Some solutions for 4X3 %e A186907 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A186907 ..0..3..3....0..0..2....0..3..3....0..1..5....0..0..0....0..0..1....0..0..2 %e A186907 ..0..3..4....0..1..1....0..4..5....0..6..5....0..2..5....0..3..3....0..5..2 %e A186907 ..0..6..6....3..2..1....2..3..3....6..4..6....3..3..5....0..5..4....6..0..0 %K A186907 nonn %O A186907 1,1 %A A186907 _R. H. Hardin_ Feb 28 2011