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 A222479 #6 Jul 23 2025 02:37:53 %S A222479 1,1,1,1,1,1,4,1,1,4,5,10,5,10,5,14,11,42,42,11,14,17,126,45,235,45, %T A222479 126,17,75,139,1582,1450,1450,1582,139,75,95,2033,2953,30883,11994, %U A222479 30883,2953,2033,95,411,2229,104833,267772,574388,574388,267772,104833,2229 %N A222479 T(n,k)=Number of nXk 0..3 arrays with no more than floor(nXk/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..3 order. %C A222479 Table starts %C A222479 ....1......1.........1............4...............5...............14 %C A222479 ....1......1.........1...........10..............11..............126 %C A222479 ....1......1.........5...........42..............45.............1582 %C A222479 ....4.....10........42..........235............1450............30883 %C A222479 ....5.....11........45.........1450...........11994...........574388 %C A222479 ...14....126......1582........30883..........574388.........18213127 %C A222479 ...17....139......2953.......267772.........4927416........544804117 %C A222479 ...75...2033....104833......7073732.......482530769......39402895960 %C A222479 ...95...2229....179105.....67911068......4741171798....1636155043302 %C A222479 ..411..36255...6910335...1835377464....481046300094..146686792732538 %C A222479 ..519..39685..12297363..17762404598...4838816683797.6439927626021526 %C A222479 .2522.667198.463356818.478005487727.496656128182183 %H A222479 R. H. Hardin, <a href="/A222479/b222479.txt">Table of n, a(n) for n = 1..143</a> %e A222479 Some solutions for n=4 k=4 %e A222479 ..0..1..1..1....0..0..0..1....0..0..0..1....0..0..0..0....0..0..0..1 %e A222479 ..1..1..1..1....0..0..0..2....0..0..0..2....0..0..0..0....0..0..0..1 %e A222479 ..2..1..1..1....0..0..0..0....0..0..0..2....0..0..0..0....0..0..0..2 %e A222479 ..0..1..1..1....0..0..0..2....0..0..0..1....1..1..0..1....0..0..0..0 %Y A222479 Column 1 is A222372 %K A222479 nonn,tabl %O A222479 1,7 %A A222479 _R. H. Hardin_ Feb 21 2013