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 A181202 a(n)=0!*1!*2!*3!*(4*n)!*6*n*(n-1) / ((n)!*(n+1)!*(n+2)!*(n+3)!) 1
 0, 168, 16632, 1729728, 199536480, 25241364720, 3445446284280, 500598983364480, 76591644454765440, 12237255920840932800, 2028351316862121451200, 346968438887939861076480, 60995474427232155123331200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS (Empirical) Number of nX4 matrices containing a defective permutation of 1..4*n in strictly increasing order rowwise and columnwise, with one permutation value omitted and one repeated (see example) Column 4 of A181204 LINKS R. H. Hardin, Table of n, a(n) for n=1..50 EXAMPLE Some solutions for 2X4 ..1..3..4..5....1..2..4..5....2..4..5..7....1..2..3..4....1..3..4..6 ..2..5..7..8....3..5..7..8....3..6..7..8....4..5..6..8....5..6..7..8 CROSSREFS Sequence in context: A282586 A035827 A075920 * A076006 A210815 A282375 Adjacent sequences:  A181199 A181200 A181201 * A181203 A181204 A181205 KEYWORD nonn AUTHOR R. H. Hardin Oct 10 2010 STATUS approved

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Last modified June 18 18:04 EDT 2021. Contains 345120 sequences. (Running on oeis4.)