The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221553 Number of 3Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns 1
 2, 71, 1930, 48018, 1200093, 29961271, 747830157, 18664821555, 465841969135, 11626559958154, 290177113520981, 7242272238158273, 180753392894785450, 4511261939241006332, 112592541470281392840, 2810096262246752615123 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A221551 LINKS R. H. Hardin, Table of n, a(n) for n = 1..85 EXAMPLE Some solutions for n=3 ..1..0..0....2..1..0....2..1..1....0..2..1....1..1..1....0..3..1....1..0..0 ..3..0..2....1..0..1....1..1..1....2..0..1....3..0..0....1..0..0....3..0..3 ..1..1..1....1..3..0....0..2..0....0..2..1....0..1..2....1..1..2....1..0..1 CROSSREFS Sequence in context: A202813 A081368 A221959 * A071871 A055030 A185120 Adjacent sequences:  A221550 A221551 A221552 * A221554 A221555 A221556 KEYWORD nonn AUTHOR R. H. Hardin Jan 19 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)