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A252771 Number of (n+2)X(1+2) 0..3 arrays with every consecutive three elements in every row, column and nw-se diagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
234, 1028, 4687, 22295, 105956, 507049, 2429173, 11652188, 55960799, 268783174, 1291581364, 6207376902, 29836567197, 143422264585, 689472936242, 3314565767875, 15934867914351, 76608704638459, 368308600684650 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A252777

LINKS

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

R. H. Hardin, Empirical recurrence of order 63

FORMULA

Empirical recurrence of order 63 (see link above)

EXAMPLE

Some solutions for n=4

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

..2..1..2....1..2..2....1..2..2....1..2..1....1..2..1....1..0..1....2..1..1

..2..1..1....0..0..2....0..0..2....1..1..0....0..2..0....1..2..2....0..2..0

..1..3..1....0..2..0....1..2..1....0..2..0....0..1..1....0..2..2....0..1..1

..1..3..3....1..2..2....1..2..2....0..2..2....3..1..1....1..0..1....2..2..1

..3..2..3....1..1..2....0..0..2....2..0..0....3..3..0....0..2..2....0..1..0

CROSSREFS

Sequence in context: A287878 A252338 A252777 * A251515 A251508 A185482

Adjacent sequences:  A252768 A252769 A252770 * A252772 A252773 A252774

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2014

STATUS

approved

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Last modified October 31 11:50 EDT 2020. Contains 338101 sequences. (Running on oeis4.)