A183366 Number of n X 4 binary arrays with no element equal to the sum modulo 3 of its horizontal and vertical neighbors.

3, 12, 39, 138, 548, 2129, 8311, 32933, 130750, 519980, 2069494, 8238734, 32801506, 130618157, 520176813, 2071605150, 8250287558, 32857555574, 130858980239, 521161959522, 2075594388132, 8266327630092, 32921750282882, 131115278622574, 522184203094342, 2079668830404846

Offset

1,1

Links

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

Example

Some solutions for 5 X 4:
  1 0 1 0    1 0 0 0    1 1 0 0    1 1 0 0    1 1 1 0
  0 0 0 1    0 0 1 1    1 1 0 1    1 1 0 1    1 0 1 0
  0 1 0 0    1 0 1 1    0 0 0 0    0 0 0 0    1 1 1 0
  1 0 0 1    0 0 1 1    1 1 1 0    0 1 1 1    0 0 0 0
  0 0 1 0    1 0 0 0    1 1 1 0    0 1 1 1    1 0 0 1

Crossrefs

Column 4 of A183368.

Sequence in context: A290906 A110153 A343360 * A122994 A271218 A062311

Adjacent sequences: A183363 A183364 A183365 * A183367 A183368 A183369

Keyword

nonn

Author

R. H. Hardin, Jan 04 2011

Status

approved