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 A295716 T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1, 2 or 4 1s. 7
 2, 4, 4, 8, 16, 8, 16, 57, 57, 16, 32, 209, 385, 209, 32, 64, 768, 2580, 2580, 768, 64, 128, 2816, 17364, 31985, 17364, 2816, 128, 256, 10329, 116902, 396571, 396571, 116902, 10329, 256, 512, 37889, 786804, 4919857, 9056598, 4919857, 786804, 37889, 512 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ...2......4........8.........16............32..............64 ...4.....16.......57........209...........768............2816 ...8.....57......385.......2580.........17364..........116902 ..16....209.....2580......31985........396571.........4919857 ..32....768....17364.....396571.......9056598.......206899873 ..64...2816...116902....4919857.....206899873......8705322572 .128..10329...786804...61023234....4725935539....366212961052 .256..37889..5295555..756896741..107948235688..15405701771951 .512.138980.35642190.9388238587.2465745246117.648089607011677 LINKS R. H. Hardin, Table of n, a(n) for n = 1..264 FORMULA Empirical for column k: k=1: a(n) = 2*a(n-1) k=2: a(n) = 3*a(n-1) +2*a(n-2) +2*a(n-3) -a(n-4) -a(n-5) k=3: [order 12] k=4: [order 28] k=5: [order 76] EXAMPLE Some solutions for n=4 k=4 ..0..0..0..0....0..0..1..1....0..1..0..0....0..0..1..1....0..1..0..1 ..0..1..0..0....1..0..0..1....0..0..0..0....0..0..0..0....1..1..1..0 ..1..0..1..1....0..0..1..0....1..0..1..1....0..0..1..1....0..1..0..1 ..0..1..1..0....0..0..1..0....1..0..1..0....1..0..0..1....1..0..1..1 CROSSREFS Column 1 is A000079. Column 2 is A283124. Sequence in context: A368043 A283691 A283130 * A282399 A297374 A297102 Adjacent sequences: A295713 A295714 A295715 * A295717 A295718 A295719 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Nov 26 2017 STATUS approved

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Last modified May 26 04:31 EDT 2024. Contains 372807 sequences. (Running on oeis4.)