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 A220279 T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..1 nXk array 5
 1, 1, 1, 2, 6, 2, 4, 25, 25, 4, 7, 87, 148, 87, 7, 12, 322, 1142, 1142, 322, 12, 21, 1168, 7987, 14111, 7987, 1168, 21, 37, 4303, 55034, 192553, 192553, 55034, 4303, 37, 65, 15680, 383153, 2539218, 4761666, 2539218, 383153, 15680, 65, 114, 57251, 2657666 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Table starts ...1.....1.......2........4.........7........12.......21........37.......65 ...1.....6......25.......87.......322......1168.....4303.....15680....57251 ...2....25.....148.....1142......7987.....55034...383153...2657666.18466741 ...4....87....1142....14111....192553...2539218.33491982.441269929 ...7...322....7987...192553...4761666.120451866 ..12..1168...55034..2539218.120451866 ..21..4303..383153.33491982 ..37.15680.2657666 ..65.57251 .114 LINKS R. H. Hardin, Table of n, a(n) for n = 1..59 EXAMPLE Some solutions for n=3 k=4 ..0..1..0..1....0..0..0..0....1..0..1..1....0..0..0..1....0..1..0..0 ..1..0..0..1....1..1..1..0....0..0..1..1....0..0..1..1....0..0..0..0 ..0..0..0..0....0..1..1..0....0..0..0..1....1..0..1..0....1..0..0..1 CROSSREFS Column 1 is A005251(n+1) Sequence in context: A220242 A220375 A220430 * A221188 A220532 A060295 Adjacent sequences: A220276 A220277 A220278 * A220280 A220281 A220282 KEYWORD nonn,tabl AUTHOR R. H. Hardin Dec 09 2012 STATUS approved

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Last modified May 29 15:14 EDT 2023. Contains 363042 sequences. (Running on oeis4.)