# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a221780 Showing 1-1 of 1 %I A221780 #4 Jan 25 2013 09:33:45 %S A221780 1,3,1,8,25,1,21,258,184,1,55,2631,7676,1367,1,144,26861,311500, %T A221780 230621,10179,1,377,273816,12449782,36959565,6911480,75782,1,987, %U A221780 2792384,496125037,5758151603,4383899151,207263892,564169,1,2584,28476902 %N A221780 T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns %C A221780 Table starts %C A221780 .1.......3..........8...........21............55..........144.........377 %C A221780 .1......25........258.........2631.........26861.......273816.....2792384 %C A221780 .1.....184.......7676.......311500......12449782....496125037.19763197787 %C A221780 .1....1367.....230621.....36959565....5758151603.889201607649 %C A221780 .1...10179....6911480...4383899151.2659707427087 %C A221780 .1...75782..207263892.519828193272 %C A221780 .1..564169.6215606652 %C A221780 .1.4200043 %C A221780 .1 %H A221780 R. H. Hardin, Table of n, a(n) for n = 1..48 %e A221780 Some solutions for n=3 k=4 %e A221780 ..0..3..0..1....0..2..3..1....0..1..1..3....0..2..1..0....0..0..0..0 %e A221780 ..0..2..3..1....0..2..1..0....1..0..2..0....0..0..4..0....1..4..3..1 %e A221780 ..0..1..0..1....2..0..0..1....1..0..3..0....1..2..0..2....0..0..1..2 %Y A221780 Row 1 is A001906 %K A221780 nonn,tabl %O A221780 1,2 %A A221780 _R. H. Hardin_ Jan 25 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE