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 A203821 Number of (n+1)X4 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
 11664, 571536, 28005264, 1372257936, 67240638864, 3294791304336, 161444773912464, 7910793921710736, 387628902163826064, 18993816206027477136, 930696994095346379664, 45604152710671972603536 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A203826 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 11664*49^(n-1) EXAMPLE Some solutions for n=4 ..2..1..1..2....0..2..0..1....1..3..3..0....2..3..1..1....3..1..1..2 ..2..3..3..2....3..3..0..1....0..2..1..1....1..3..0..3....0..2..0..2 ..0..0..1..1....1..1..2..1....1..2..3..2....1..3..1..3....0..3..3..2 ..1..2..2..3....2..3..2..0....3..0..0..2....0..2..1..2....1..2..1..1 ..0..3..0..0....1..1..2..3....1..1..1..1....3..2..3..0....3..2..0..3 CROSSREFS Sequence in context: A151600 A214804 A352330 * A223598 A223439 A223691 Adjacent sequences: A203818 A203819 A203820 * A203822 A203823 A203824 KEYWORD nonn AUTHOR R. H. Hardin Jan 06 2012 STATUS approved

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Last modified October 2 04:44 EDT 2023. Contains 365831 sequences. (Running on oeis4.)