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, 3, 53, 2229, 240463, 67479838, 48809162176, 90926518437773, 436444614204907032, 5400843845781866915026, 172295115662202424268978762

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