A222372 Number of nX1 0..3 arrays with no more than floor(nX1/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

1, 1, 1, 4, 5, 14, 17, 75, 95, 411, 519, 2522, 3211, 15919, 20299, 103627, 132515, 683480, 875491, 4554799, 5844093, 30542304, 39239961, 205785953, 264702489, 1391485044, 1791699029, 9436529666, 12161620195, 64150640719, 82742154707

Offset

1,4

Comments

Column 1 of A222378

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

All solutions for n=4
..0....0....0....0
..0....0....1....0
..1....0....1....0
..1....0....1....1

Crossrefs

Sequence in context: A262903 A079362 A222364 * A302348 A029862 A092432

Adjacent sequences: A222369 A222370 A222371 * A222373 A222374 A222375

Keyword

nonn

Author

R. H. Hardin Feb 17 2013

Status

approved