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 A263420 Number of nX2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 2. 1
 1, 4, 36, 196, 961, 5329, 29584, 160000, 868624, 4739329, 25816561, 140517316, 765186244, 4167218916, 22692108321, 123567013441, 672885527616, 3664192267264, 19953231345216, 108654793385121, 591677262389889 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A263424. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) +4*a(n-2) +22*a(n-3) +14*a(n-4) -93*a(n-5) -68*a(n-6) +52*a(n-7) +32*a(n-8) +36*a(n-9) +45*a(n-10) -16*a(n-11) +8*a(n-12) -6*a(n-13) -2*a(n-14) +a(n-15) EXAMPLE Some solutions for n=4 ..0..5....3..5....0..5....3..1....0..5....3..2....0..1....0..5....4..1....3..2 ..1..4....1..7....1..4....6..0....1..3....6..4....2..3....1..3....5..0....5..0 ..7..2....0..6....7..6....4..2....7..6....0..1....4..5....4..2....3..6....4..1 ..6..3....2..4....2..3....5..7....2..4....5..7....6..7....6..7....2..7....6..7 CROSSREFS Cf. A263424. Sequence in context: A034569 A270084 A272222 * A302946 A220436 A144888 Adjacent sequences:  A263417 A263418 A263419 * A263421 A263422 A263423 KEYWORD nonn AUTHOR R. H. Hardin, Oct 17 2015 STATUS approved

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Last modified February 28 22:53 EST 2020. Contains 332337 sequences. (Running on oeis4.)