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 A221628 Number of 6Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row 1
 1, 7, 7279, 14576404, 230141263315, 7575106427737240, 827196295133181978340, 177037611175595181692394660, 86030164534670200470739520304375, 75149351745335662460465241596540458600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 6 of A221623 LINKS R. H. Hardin, Table of n, a(n) for n = 1..13 EXAMPLE Some solutions for n=3 ..2..3..1....1..2..3....1..3..2....1..3..2....3..1..2....1..3..2....3..1..2 ..1..3..2....1..2..3....2..1..3....1..3..2....3..1..2....2..3..1....1..3..2 ..3..1..2....2..1..3....2..3..1....2..3..1....1..3..2....2..1..3....2..1..3 ..1..3..2....2..3..1....2..1..3....2..3..1....1..3..2....3..1..2....2..1..3 ..2..3..1....3..1..2....1..3..2....3..1..2....2..1..3....2..3..1....2..1..3 ..3..1..2....2..3..1....2..3..1....2..3..1....2..3..1....1..3..2....3..2..1 CROSSREFS Sequence in context: A343145 A068575 A158400 * A220879 A119528 A116266 Adjacent sequences: A221625 A221626 A221627 * A221629 A221630 A221631 KEYWORD nonn AUTHOR R. H. Hardin Jan 21 2013 STATUS approved

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Last modified March 3 04:18 EST 2024. Contains 370499 sequences. (Running on oeis4.)