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 A220430 T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..3 nXk array 3
 1, 1, 1, 2, 6, 2, 4, 23, 23, 4, 7, 94, 236, 94, 7, 12, 380, 2103, 2103, 380, 12, 21, 1494, 18366, 40412, 18366, 1494, 21, 37, 5939, 155250, 735555, 735555, 155250, 5939, 37, 65, 23398, 1286012, 12702453, 26927902, 12702453, 1286012, 23398, 65, 114, 92317 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Table starts ..1.....1.......2........4........7.......12........21.......37....65.114 ..1.....6......23.......94......380.....1494......5939....23398.92317 ..2....23.....236.....2103....18366...155250...1286012.10530541 ..4....94....2103....40412...735555.12702453.213282872 ..7...380...18366...735555.26927902 .12..1494..155250.12702453 .21..5939.1286012 .37.23398 .65 LINKS R. H. Hardin, Table of n, a(n) for n = 1..49 EXAMPLE Some solutions for n=3 k=4 ..1..1..0..0....1..0..0..0....1..0..1..0....1..0..0..0....1..1..1..0 ..0..0..1..0....1..0..0..1....1..0..0..0....1..0..1..0....0..0..0..0 ..0..1..0..0....1..0..1..1....0..1..1..0....0..0..0..1....0..1..1..1 CROSSREFS Column 1 is A005251(n+1) Column 2 is A220372 Sequence in context: A085193 A220242 A220375 * A220279 A221188 A220532 Adjacent sequences: A220427 A220428 A220429 * A220431 A220432 A220433 KEYWORD nonn,tabl AUTHOR R. H. Hardin Dec 14 2012 STATUS approved

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Last modified February 23 11:40 EST 2024. Contains 370283 sequences. (Running on oeis4.)