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A186556 Number of (n+1)X4 0..3 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors 4
60074, 13360840, 2976803436, 663296784123, 147795682647630, 32931888185295104, 7337893459883784628, 1635031754050410331405, 364318292831600934919531, 81177517366244082982029095 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A186558

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 3X4

..2..3..0..0....0..1..2..3....3..3..1..2....1..1..3..0....2..3..1..2

..0..1..0..2....0..3..0..2....0..2..3..2....0..2..1..2....0..1..1..1

..0..0..0..2....0..0..0..2....0..0..3..0....0..0..1..3....0..0..2..3

CROSSREFS

Sequence in context: A189985 A287047 A075671 * A205983 A218488 A257754

Adjacent sequences:  A186553 A186554 A186555 * A186557 A186558 A186559

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 23 2011

STATUS

approved

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Last modified June 5 08:21 EDT 2020. Contains 334829 sequences. (Running on oeis4.)