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 A252256 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 3 6 or 7 0
 1072, 1016, 596, 1316, 3530, 9836, 33218, 252162, 1017410, 4251650, 95453186, 461119490, 2176843778, 165104582658, 884163477506, 4458176053250 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A252260 LINKS EXAMPLE Some solutions for n=4 ..0..3..1..0..0..1....1..1..3..1..1..3....2..3..0..1..0..3....2..3..0..1..0..3 ..1..1..3..1..1..2....0..0..1..0..0..1....1..0..0..1..0..0....1..0..0..1..0..0 ..0..0..1..0..0..1....0..0..1..0..0..1....2..1..1..3..1..1....2..1..1..3..1..1 ..0..0..1..0..0..1....1..1..3..1..1..2....1..0..0..1..0..0....1..0..0..1..0..0 ..1..1..3..1..1..2....0..0..1..0..0..1....1..0..0..1..0..3....1..0..0..1..0..3 ..0..0..1..0..0..1....0..0..1..0..3..1....3..1..1..2..1..1....2..1..1..3..1..1 CROSSREFS Sequence in context: A020386 A236870 A345904 * A345525 A345779 A252257 Adjacent sequences:  A252253 A252254 A252255 * A252257 A252258 A252259 KEYWORD nonn AUTHOR R. H. Hardin, Dec 16 2014 STATUS approved

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Last modified November 29 20:40 EST 2021. Contains 349416 sequences. (Running on oeis4.)