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 A216986 Number of city-block distance 1, pressure limit 2 movements in an nX3 array with each element moving exactly one horizontally or vertically, no element acquiring more than two neighbors, and without 2-loops 1
 0, 14, 264, 4794, 83304, 1435808, 24673352, 423651134, 7272419728, 124829530972, 2142624332680, 36776621687102, 631243274484392, 10834813398096496, 185971344332908696, 3192056733158039014, 54789226054169999632 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A216991 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 24*a(n-1) -121*a(n-2) +28*a(n-3) +649*a(n-4) -844*a(n-5) +175*a(n-6) +80*a(n-7) -2*a(n-8) EXAMPLE Some solutions for n=3 (movement: 0=n 1=e 2=s 3=w) ..1..1..2....1..2..3....1..1..2....2..3..3....1..1..2....2..3..3....1..2..2 ..1..0..3....0..1..0....1..0..2....1..2..0....0..0..3....2..3..0....0..3..3 ..0..3..3....0..3..0....1..0..3....0..3..3....1..0..3....1..1..0....0..1..0 CROSSREFS Sequence in context: A304189 A115611 A205467 * A138560 A051690 A048668 Adjacent sequences:  A216983 A216984 A216985 * A216987 A216988 A216989 KEYWORD nonn AUTHOR R. H. Hardin Sep 21 2012 STATUS approved

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Last modified March 22 17:25 EDT 2019. Contains 321422 sequences. (Running on oeis4.)