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 A211708 Number of n X 3 nonnegative integer arrays with new values 0 upwards introduced in row major order and every value unique in its row and column. 0
 1, 18, 588, 30240, 2277600, 234440280, 31448589480 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A211709. LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=4: ..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2 ..2..3..0....1..3..0....1..0..3....3..0..1....1..0..3....1..0..3....1..0..3 ..1..2..3....2..0..1....2..3..0....1..2..0....3..2..1....2..3..4....2..3..1 ..3..0..1....3..4..5....3..2..1....2..3..4....2..3..0....3..5..6....3..2..0 CROSSREFS Sequence in context: A254381 A177098 A133401 * A341305 A253826 A061079 Adjacent sequences: A211705 A211706 A211707 * A211709 A211710 A211711 KEYWORD nonn AUTHOR R. H. Hardin, Apr 19 2012 STATUS approved

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Last modified December 2 20:20 EST 2023. Contains 367526 sequences. (Running on oeis4.)