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 A250673 #6 Jul 23 2025 12:40:15 %S A250673 120233,2406972,38224684,505108522,5803025694,59036115470, %T A250673 542694735983,4574838198834,35784917880517,262221403119626, %U A250673 1814189139876511,11928469877179634,74951135729008916,452187475323346430 %N A250673 Number of (n+1)X(5+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. %C A250673 Column 5 of A250676 %H A250673 R. H. Hardin, <a href="/A250673/b250673.txt">Table of n, a(n) for n = 1..210</a> %H A250673 R. H. Hardin, <a href="/A250673/a250673.txt">Empirical recurrence of order 59</a> %F A250673 Empirical recurrence of order 59 (see link above) %e A250673 Some solutions for n=1 %e A250673 ..1..3..1..0..1..1....1..2..2..2..1..0....0..2..0..3..0..3....2..3..0..1..2..0 %e A250673 ..2..2..2..1..3..3....1..2..2..2..1..0....0..3..1..2..1..2....2..3..0..3..0..2 %K A250673 nonn %O A250673 1,1 %A A250673 _R. H. Hardin_, Nov 26 2014