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A210933 Number of n X n 0..3 symmetric matrices with every element equal to zero, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order 0
1, 3, 45, 2597, 404200, 158571061, 155381740144, 379683866415546, 2311350169900872167, 35031061332072915278464 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A117253 A012833 A012747 * A027637 A228903 A198952

Adjacent sequences:  A210930 A210931 A210932 * A210934 A210935 A210936

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 29 2012

STATUS

approved

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Last modified January 28 14:26 EST 2022. Contains 350656 sequences. (Running on oeis4.)