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 A193501 Number of n X n symmetric 0..4 arrays with no element equal to the product mod 5 of any two of its horizontal and vertical neighbors 0
 5, 71, 2558, 250860, 64996451, 45170582886, 83632270690739, 415014359673696258, 5503137668192072543375 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Some solutions for 4X4 ..1..0..2..2....1..3..1..0....0..1..0..1....2..0..3..1....0..1..3..2 ..0..2..2..2....3..1..0..2....1..0..1..3....0..1..2..3....1..4..0..3 ..2..2..3..3....1..0..1..0....0..1..0..4....3..2..3..1....3..0..2..2 ..2..2..3..0....0..2..0..3....1..3..4..0....1..3..1..4....2..3..2..0 CROSSREFS Sequence in context: A033507 A092250 A193436 * A133990 A326881 A120808 Adjacent sequences:  A193498 A193499 A193500 * A193502 A193503 A193504 KEYWORD nonn AUTHOR R. H. Hardin Jul 29 2011 STATUS approved

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Last modified January 26 16:58 EST 2020. Contains 331280 sequences. (Running on oeis4.)