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 A198604 T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 8
 1, 1, 1, 2, 5, 2, 5, 32, 32, 5, 14, 251, 674, 251, 14, 41, 1985, 14396, 14396, 1985, 41, 122, 15761, 309770, 844228, 309770, 15761, 122, 365, 125168, 6671450, 49726877, 49726877, 6671450, 125168, 365, 1094, 994127, 143724590, 2934981667, 8055413256 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Table starts ....1.......1..........2............5............14............41 ....1.......5.........32..........251..........1985.........15761 ....2......32........674........14396........309770.......6671450 ....5.....251......14396.......844228......49726877....2934981667 ...14....1985.....309770.....49726877....8055413256.1308245895665 ...41...15761....6671450...2934981667.1308245895665 ..122..125168..143724590.173328303620 ..365..994127.3096625676 .1094.7895777 .3281 LINKS R. H. Hardin, Table of n, a(n) for n = 1..60 EXAMPLE All solutions for n=2 k=2 ..0..0..1..1....0..0..1..1....0..0..1..1....0..0..1..1....0..0..0..0 ..0..0..1..1....0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..0 ..2..2..3..3....1..1..0..0....2..2..0..0....1..1..2..2....0..1..1..0 ..2..2..3..3....1..1..0..0....2..2..0..0....1..1..2..2....0..0..0..0 CROSSREFS Column 1 is A007051(n-2) Sequence in context: A240706 A240642 A240774 * A198253 A159989 A195702 Adjacent sequences:  A198601 A198602 A198603 * A198605 A198606 A198607 KEYWORD nonn,tabl AUTHOR R. H. Hardin Oct 27 2011 STATUS approved

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Last modified June 4 01:54 EDT 2020. Contains 334812 sequences. (Running on oeis4.)