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 A183342 T(n,k)=Number of nXk binary arrays with each 1 adjacent to exactly one 1 vertically and one 1 horizontally 8
 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 5, 4, 1, 1, 6, 7, 7, 6, 1, 1, 9, 13, 12, 13, 9, 1, 1, 13, 23, 26, 26, 23, 13, 1, 1, 19, 37, 51, 72, 51, 37, 19, 1, 1, 28, 63, 97, 175, 175, 97, 63, 28, 1, 1, 41, 109, 193, 407, 513, 407, 193, 109, 41, 1, 1, 60, 183, 380, 1005, 1397, 1397, 1005, 380 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Equivalent to all 1s connected only in 2X2 blocks Table starts .1..1...1...1....1.....1......1.......1.......1........1.........1..........1 .1..2...3...4....6.....9.....13......19......28.......41........60.........88 .1..3...5...7...13....23.....37......63.....109......183.......309........527 .1..4...7..12...26....51.....97.....193.....380......741......1456.......2860 .1..6..13..26...72...175....407....1005....2450.....5893.....14318......34780 .1..9..23..51..175...513...1397....4133...12075....34521....100047.....290287 .1.13..37..97..407..1397...4531...16029...55471...188735....651517....2246015 .1.19..63.193.1005..4133..16029...68662..286079..1170324...4869491...20218182 .1.28.109.380.2450.12075..55471..286079.1429824..6989477..34856362..173451524 .1.41.183.741.5893.34521.188735.1170324.6989477.40840428.243887497.1451641573 LINKS R. H. Hardin, Table of n, a(n) for n = 1..839 EXAMPLE Some solutions for 6X5 ..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 ..0..0..0..0..0....0..0..1..1..0....1..1..0..0..0....0..0..0..0..0 ..0..0..1..1..0....0..0..1..1..0....1..1..0..0..0....0..0..0..0..0 ..0..0..1..1..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 ..0..0..0..0..0....1..1..0..0..0....0..0..0..0..0....0..1..1..0..0 ..0..0..0..0..0....1..1..0..0..0....0..0..0..0..0....0..1..1..0..0 CROSSREFS Diagonal is A145857 Column 2 is A000930(n+1) Column 3 is A003229 Sequence in context: A297845 A183456 A296313 * A046688 A208342 A157283 Adjacent sequences: A183339 A183340 A183341 * A183343 A183344 A183345 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jan 04 2011 STATUS approved

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Last modified May 19 07:00 EDT 2024. Contains 372666 sequences. (Running on oeis4.)