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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 1
2176, 253312, 7946432, 394724320, 15491352288, 686342587904, 28533024476512, 1225810619871552, 51768892508647296, 2205828537779532832, 93555571372805665280, 3977486749634600724032, 168891302791156877237312 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A186923
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2011
STATUS
approved

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Last modified December 6 18:41 EST 2023. Contains 367614 sequences. (Running on oeis4.)