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A193270 Number of n X n symmetric 0..4 arrays with no element equal to any horizontal or vertical neighbor and with new values 0..4 introduced in lower triangular row major order 1
1, 2, 41, 5913, 3218949, 5746014471, 33346758707039, 629041120985307133, 38569311842617827824519, 7686740212720656511786911885, 4979434019923682892902923543291527 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..12

EXAMPLE

Some solutions for 4X4

..0..1..0..2....0..1..0..1....0..1..0..2....0..1..3..1....0..1..3..4

..1..2..3..1....1..2..1..0....1..2..1..3....1..2..4..3....1..2..1..0

..0..3..1..0....0..1..2..1....0..1..2..4....3..4..1..4....3..1..4..3

..2..1..0..1....1..0..1..3....2..3..4..3....1..3..4..1....4..0..3..1

CROSSREFS

Sequence in context: A098634 A278847 A297007 * A350859 A076391 A348773

Adjacent sequences:  A193267 A193268 A193269 * A193271 A193272 A193273

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 20 2011

STATUS

approved

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Last modified September 28 14:44 EDT 2022. Contains 357073 sequences. (Running on oeis4.)