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 A181199 Number of 5 X n matrices containing a permutation of 1..5*n in increasing order rowwise, columnwise, diagonally and (downwards) antidiagonally. 2
 1, 1, 16, 985, 141696, 36372976, 14083834704, 7372392431849, 4848332563899256, 3808369342900073856, 3447336241467721584256, 3503140094024746011745456, 3918646197894288330216058576, 4753102567048482059557067412816, 6178133154985813161258658378449616 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row 5 of A181196. LINKS Alois P. Heinz, Table of n, a(n) for n = 1..26 EXAMPLE Some solutions for 5 X 4: ..1..2..3..4....1..2..3..4....1..2..3..4....1..2..3..4....1..2..3..4 ..5..6..7..8....5..6..7..8....5..6..7..8....5..6..7..8....5..6..7..8 ..9.10.11.12....9.10.11.12....9.10.11.12....9.10.11.12....9.10.11.12 .13.14.15.16...13.14.15.17...13.14.15.18...13.14.16.17...13.14.16.18 .17.18.19.20...16.18.19.20...16.17.19.20...15.18.19.20...15.17.19.20 CROSSREFS Cf. A181196. Sequence in context: A264640 A211086 A187802 * A024301 A211090 A160012 Adjacent sequences:  A181196 A181197 A181198 * A181200 A181201 A181202 KEYWORD nonn AUTHOR R. H. Hardin, Oct 10 2010 EXTENSIONS a(11)-a(26) from Alois P. Heinz, Jul 24 2012 STATUS approved

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Last modified May 15 10:54 EDT 2021. Contains 343909 sequences. (Running on oeis4.)