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 A251250 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge 1
 8, 56, 464, 9130, 185620, 10753448, 539961360, 93638134256, 11614033584212, 6069296782136816, 1858635679067134948, 2934840645254762222638, 2219326155667975726270428, 10595742529538275240832027216 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A251258 LINKS R. H. Hardin, Table of n, a(n) for n = 1..17 EXAMPLE Some solutions for n=4 ..1..0..1..0..1....1..1..1..1..1....0..0..1..1..1....0..0..1..0..1 ..0..0..1..0..1....0..0..0..0..0....1..0..0..0..0....1..0..0..0..0 ..1..0..1..0..1....1..0..1..0..1....0..0..1..0..1....1..0..1..0..1 ..1..0..0..0..0....1..0..1..0..1....1..0..1..0..1....1..0..0..0..0 ..0..0..1..0..1....0..0..1..0..0....1..0..0..0..0....0..0..1..1..1 CROSSREFS Sequence in context: A027081 A093134 A001398 * A087290 A086787 A218125 Adjacent sequences: A251247 A251248 A251249 * A251251 A251252 A251253 KEYWORD nonn AUTHOR R. H. Hardin, Dec 01 2014 STATUS approved

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Last modified February 3 00:09 EST 2023. Contains 360024 sequences. (Running on oeis4.)