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 A205247 #8 Jul 22 2025 18:41:40 %S A205247 16,168,5212,387328,67731268,27913330476,27149753088796, %T A205247 62383316832685352,338853014329060508764,4353185098169744392741452, %U A205247 132316928041105714306034574484,9518293354852895518368238072987356 %N A205247 Number of (n+1)X(n+1) 0..1 arrays with the number of clockwise edge increases in every 2X2 subblock the same. %C A205247 Diagonal of A205255 %H A205247 R. H. Hardin, <a href="/A205247/b205247.txt">Table of n, a(n) for n = 1..14</a> %e A205247 Some solutions for n=4 %e A205247 ..1..0..0..0..0....1..0..0..0..0....1..1..1..1..1....0..0..0..1..0 %e A205247 ..1..1..0..1..0....1..0..1..0..1....1..1..1..1..1....1..1..0..1..0 %e A205247 ..1..0..0..1..1....1..0..1..1..1....1..1..1..1..1....0..0..0..0..0 %e A205247 ..1..1..1..1..0....1..1..1..0..1....1..1..1..1..1....1..1..0..1..0 %e A205247 ..0..0..1..0..0....0..1..0..0..1....1..1..1..1..1....1..0..0..1..0 %K A205247 nonn %O A205247 1,1 %A A205247 _R. H. Hardin_ Jan 24 2012