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 A223674 #6 Jul 23 2025 04:22:43 %S A223674 128,16384,371641,2343189,8052573,21347949,51831694,124050234, %T A223674 299298122,726344042,1747724083,4106362589,9335920794,20497890026, %U A223674 43553671579,89873040155,180673406871,354644672067,680755779412,1279369459830 %N A223674 Number of 7Xn 0..1 arrays with rows, diagonals and antidiagonals unimodal. %C A223674 Row 7 of A223669 %H A223674 R. H. Hardin, <a href="/A223674/b223674.txt">Table of n, a(n) for n = 1..33</a> %e A223674 Some solutions for n=3 %e A223674 ..0..0..1....0..0..1....0..0..0....0..0..0....0..0..1....0..0..1....0..0..0 %e A223674 ..0..1..0....0..1..0....0..0..0....0..0..1....0..1..1....1..0..0....0..0..0 %e A223674 ..1..1..1....1..0..0....1..1..1....0..0..1....1..1..0....0..1..1....0..1..1 %e A223674 ..0..0..0....0..1..1....0..1..0....0..0..0....1..1..1....0..0..0....0..1..1 %e A223674 ..0..0..0....0..1..0....0..0..1....0..0..0....1..0..0....0..0..0....0..0..0 %e A223674 ..1..1..1....1..0..0....0..1..0....0..0..1....0..0..0....1..1..1....0..0..1 %e A223674 ..1..1..0....1..0..0....0..0..0....1..1..0....0..0..0....1..0..0....0..1..0 %K A223674 nonn %O A223674 1,1 %A A223674 _R. H. Hardin_ Mar 25 2013