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A203390 Number of n X n 0..3 arrays with every nonzero element less than or equal to some NW, E or S neighbor 0
1, 16, 7785, 18530502, 474618867194, 149902909246835321, 535800823449864962697227, 20614712434599379183066014500691, 8729478655533855038607697299128077953713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203397

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A097547 A088654 A079920 * A221085 A280845 A069986

Adjacent sequences:  A203387 A203388 A203389 * A203391 A203392 A203393

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 01 2012

STATUS

approved

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Last modified October 1 00:48 EDT 2022. Contains 357126 sequences. (Running on oeis4.)