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 A200930 #7 Jul 22 2025 16:00:25 %S A200930 7,21,57,107,151,134,70,906,5719,22641,57330,94749,91284,46026,712408, %T A200930 5250502,23239004,63993718,111584800,110564320,55707400,931579960, %U A200930 7356246430,34247930590,97967909500,175167537020,176238424600 %N A200930 Number of nX1 0..6 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. %C A200930 Column 1 of A200935 %H A200930 R. H. Hardin, <a href="/A200930/b200930.txt">Table of n, a(n) for n = 1..129</a> %e A200930 Some solutions for n=3 %e A200930 ..0....4....1....3....1....0....0....2....0....1....1....3....2....1....1....0 %e A200930 ..1....5....6....4....2....1....2....3....4....2....4....6....4....5....3....5 %e A200930 ..6....6....4....6....3....4....6....4....2....6....5....5....6....3....6....6 %K A200930 nonn %O A200930 1,1 %A A200930 _R. H. Hardin_ Nov 24 2011