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A300683 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 53, 2229, 240463, 67479838, 48809162176, 90926518437773, 436444614204907032, 5400843845781866915026, 172295115662202424268978762 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A300689.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300689.

Sequence in context: A098932 A100444 A300420 * A296678 A227051 A300606

Adjacent sequences:  A300680 A300681 A300682 * A300684 A300685 A300686

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 11 2018

STATUS

approved

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Last modified February 28 08:52 EST 2021. Contains 341695 sequences. (Running on oeis4.)