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 A203871 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order 0
 7, 1135, 1166887, 6542729803, 200096473566151, 33391264599507183643, 30407052005824642303153447, 151104658685287487942495927080315 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A203878 LINKS EXAMPLE Some solutions for n=4 ..0..0..0..0..0....0..0..0..0..0....0..1..0..0..0....0..0..0..0..1 ..1..2..1..1..2....1..1..1..1..1....2..3..2..1..2....1..1..1..2..3 ..3..0..0..3..3....0..2..0..2..0....0..3..2..3..0....2..2..3..0..3 ..3..1..1..1..0....1..1..3..1..1....0..1..0..3..0....3..0..1..2..3 ..0..0..0..2..2....2..2..3..2..2....2..3..2..3..0....2..0..1..2..1 CROSSREFS Sequence in context: A203583 A259251 A259253 * A144927 A202133 A229431 Adjacent sequences:  A203868 A203869 A203870 * A203872 A203873 A203874 KEYWORD nonn AUTHOR R. H. Hardin Jan 07 2012 STATUS approved

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Last modified October 20 10:32 EDT 2019. Contains 328257 sequences. (Running on oeis4.)