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 A252313 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7 0
 1557, 1974, 2493, 23422, 505062, 17562749, 937981280, 77093724660, 9818091215415, 1923038551367392, 579363831611000707, 269256446506102901260, 192945586040744107580301 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A252321 LINKS Table of n, a(n) for n=1..13. EXAMPLE Some solutions for n=4 ..3..2..3..3..3..3....3..3..3..3..3..3....3..3..3..3..2..3....3..3..3..3..3..2 ..3..3..3..2..3..3....3..3..2..3..3..3....2..3..3..3..3..2....3..3..3..3..3..3 ..3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3....2..3..3..3..3..3 ..2..3..3..3..3..3....3..2..3..3..3..3....3..3..3..3..3..3....3..3..3..2..3..3 ..3..3..2..3..3..2....3..3..3..3..3..3....2..3..3..3..2..3....3..2..3..3..3..2 ..3..3..3..3..2..3....3..3..2..3..3..3....3..3..2..3..3..3....3..3..3..3..3..3 CROSSREFS Sequence in context: A229434 A022222 A166606 * A252321 A252314 A186393 Adjacent sequences: A252310 A252311 A252312 * A252314 A252315 A252316 KEYWORD nonn AUTHOR R. H. Hardin, Dec 16 2014 STATUS approved

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Last modified May 27 17:52 EDT 2024. Contains 372880 sequences. (Running on oeis4.)