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 A181213 Number of n X n binary matrices with no three 1's adjacent in a line diagonally or antidiagonally 1
 2, 16, 400, 28561, 7133488, 5037592576, 11494250657760, 81903288018125025, 1774095560440527819780, 120560883729040740095954944, 25387802734116842287569948104640, 16523941893729018365186706701633818689 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A181217 LINKS R. H. Hardin, Table of n, a(n) for n=1..20 EXAMPLE Some avoided solutions for 4X4 ..1..0..0..0....0..0..0..0....0..0..0..1....0..1..0..0....0..0..1..0 ..0..1..0..0....0..0..1..1....0..1..1..0....0..0..1..0....0..1..0..0 ..0..0..1..1....0..0..1..0....0..1..0..0....1..0..0..1....1..0..0..0 ..0..0..0..0....0..1..0..0....0..0..0..0....0..0..0..0....0..0..1..0 CROSSREFS Sequence in context: A188904 A189104 A347914 * A283851 A130276 A027871 Adjacent sequences:  A181210 A181211 A181212 * A181214 A181215 A181216 KEYWORD nonn AUTHOR R. H. Hardin Oct 10 2010 STATUS approved

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Last modified May 17 14:19 EDT 2022. Contains 353746 sequences. (Running on oeis4.)