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 A263424 T(n,k)=Number of nXk arrays of permutations of 0..n*k-1 with each element moved a city block distance of 0 or 2. 5
 1, 1, 1, 2, 4, 2, 4, 36, 36, 4, 6, 196, 1272, 196, 6, 9, 961, 26244, 26244, 961, 9, 15, 5329, 532620, 1993744, 532620, 5329, 15, 25, 29584, 11751184, 141086884, 141086884, 11751184, 29584, 25, 40, 160000, 256052940, 10808097444, 34502512032 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Table starts ..1......1..........2............4.............6.............9...............15 ..1......4.........36..........196...........961..........5329............29584 ..2.....36.......1272........26244........532620......11751184........256052940 ..4....196......26244......1993744.....141086884...10808097444.....831331827076 ..6....961.....532620....141086884...34502512032.9414955824400.2581177525941432 ..9...5329...11751184..10808097444.9414955824400 .15..29584..256052940.831331827076 .25.160000.5521233025 .40.868624 .64 LINKS R. H. Hardin, Table of n, a(n) for n = 1..60 FORMULA Empirical for column k: k=1: a(n) = a(n-1) +a(n-3) +a(n-4) k=2: [order 15] k=3: [order 64] EXAMPLE Some solutions for n=3 k=4 ..2..9..0..1....8..9..7..6....0..4..7..6....8..4..0..3....5..6.10.11 ..4..7.11.10....1..5.11..2....9..2..1.10....1..5.11..7....1..0..4..7 ..5..6..8..3....0..4.10..3....5.11..8..3...10..9..2..6....8..9..2..3 CROSSREFS Column 1 is A006498. Sequence in context: A139548 A193378 A108445 * A279527 A019294 A238262 Adjacent sequences:  A263421 A263422 A263423 * A263425 A263426 A263427 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Oct 17 2015 STATUS approved

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Last modified April 23 13:14 EDT 2021. Contains 343204 sequences. (Running on oeis4.)