A186917 Number of (n+1)X4 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

2176, 253312, 7946432, 394724320, 15491352288, 686342587904, 28533024476512, 1225810619871552, 51768892508647296, 2205828537779532832, 93555571372805665280, 3977486749634600724032, 168891302791156877237312

Offset

1,1

Comments

Column 3 of A186923

Links

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

Example

Some solutions for 3X4
..0..0..2..1....2..1..2..1....2..3..0..2....0..0..2..3....2..3..0..3
..3..2..2..0....0..0..2..0....3..2..1..3....0..2..2..3....2..2..1..2
..3..2..3..0....3..2..3..0....0..1..2..2....0..2..0..3....0..3..3..1

Crossrefs

Sequence in context: A252348 A252522 A159712 * A185801 A170776 A250240

Adjacent sequences: A186914 A186915 A186916 * A186918 A186919 A186920

Keyword

nonn

Author

R. H. Hardin Feb 28 2011

Status

approved