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 A218823 #6 Jul 23 2025 00:06:24 %S A218823 1,2,2,4,11,4,7,35,35,7,12,108,195,108,12,21,337,1028,1028,337,21,37, %T A218823 1049,5529,8961,5529,1049,37,65,3268,29593,80692,80692,29593,3268,65, %U A218823 114,10179,158648,720305,1229783,720305,158648,10179,114,200,31707,850155 %N A218823 T(n,k)=Unmatched value maps: number of nXk binary arrays indicating the locations of corresponding elements not equal to any king-move neighbor in a random 0..2 nXk array. %C A218823 Table starts %C A218823 ...1......2........4.........7.........12..........21..........37...........65 %C A218823 ...2.....11.......35.......108........337........1049........3268........10179 %C A218823 ...4.....35......195......1028.......5529.......29593......158648.......850155 %C A218823 ...7....108.....1028......8961......80692......720305.....6449353.....57696032 %C A218823 ..12....337.....5529.....80692....1229783....18519049...280040904...4229571209 %C A218823 ..21...1049....29593....720305...18519049...468783431.11931365309.303182474797 %C A218823 ..37...3268...158648...6449353..280040904.11931365309 %C A218823 ..65..10179...850155..57696032.4229571209 %C A218823 .114..31707..4556371.516297052 %C A218823 .200..98764.24418812 %C A218823 .351.307641 %C A218823 .616 %H A218823 R. H. Hardin, <a href="/A218823/b218823.txt">Table of n, a(n) for n = 1..84</a> %e A218823 Some solutions for n=3 k=4 %e A218823 ..0..0..0..0....0..0..0..1....0..0..1..0....0..0..1..0....1..0..0..0 %e A218823 ..0..0..0..0....1..0..0..0....0..0..1..0....1..0..0..1....1..0..0..0 %e A218823 ..0..1..1..0....1..0..0..0....1..0..1..0....1..0..1..0....1..0..0..0 %Y A218823 Column 1 is A005251(n+2) %Y A218823 Column 2 is A052550(n+1) %Y A218823 Column 3 is A184200(n-1) %K A218823 nonn,tabl %O A218823 1,2 %A A218823 _R. H. Hardin_ Nov 06 2012