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A222680 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
2, 1, 5, 10, 25, 150, 359, 2249, 6511, 39991, 119033, 747758, 2254819, 14115927, 43486517, 268330409, 844434635, 5129191736, 16468845241, 98454511005, 322307191185, 1896450581728, 6325288982445, 36644084370361, 124416281370753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A222679

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..45

EXAMPLE

All solutions for n=3

..0..1..1....0..0..0....0..0..1....0..0..0....0..0..0

..1..1..1....0..0..0....0..0..0....0..0..1....1..0..0

CROSSREFS

Sequence in context: A226311 A049948 A222574 * A110352 A107310 A277279

Adjacent sequences:  A222677 A222678 A222679 * A222681 A222682 A222683

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2013

STATUS

approved

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Last modified December 6 06:14 EST 2021. Contains 349563 sequences. (Running on oeis4.)