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 A221389 Number of 3Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2 1
 0, 0, 4, 94, 1450, 20689, 284702, 3856027, 51806212, 693213401, 9256626752, 123474805622, 1646142914632, 21939928353674, 292375085482054, 3895949812693799, 51912242778609770, 691699897071467742 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row 3 of A221388 LINKS R. H. Hardin, Table of n, a(n) for n = 1..37 EXAMPLE All solutions for n=3 ..0..2..1....0..2..1....0..2..0....0..2..1 ..1..2..1....0..2..1....1..2..1....1..2..0 ..0..2..0....1..2..0....1..2..0....1..2..0 CROSSREFS Sequence in context: A321221 A116291 A061992 * A220374 A220429 A210857 Adjacent sequences:  A221386 A221387 A221388 * A221390 A221391 A221392 KEYWORD nonn AUTHOR R. H. Hardin Jan 14 2013 STATUS approved

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Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)