A300429 Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 2, 13, 87, 704, 6677, 75553, 1012416, 16998387, 349644776, 9034633150

Offset

1,2

Comments

Diagonal of A300435.

Links

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

Example

Some solutions for n=5
..0..0..1..0..1. .0..0..1..0..0. .0..0..1..0..1. .0..0..0..1..1
..0..1..0..1..0. .0..1..1..1..1. .1..0..1..0..1. .0..0..1..0..0
..1..0..1..0..0. .1..1..0..0..0. .1..0..1..0..0. .0..1..0..1..0
..1..0..1..1..1. .0..1..1..1..1. .1..0..1..1..0. .1..0..1..0..1
..1..0..0..0..1. .0..0..0..0..0. .1..0..0..1..1. .1..0..0..1..1

Crossrefs

Cf. A300435.

Sequence in context: A091116 A091099 A092849 * A106938 A106937 A033891

Adjacent sequences: A300426 A300427 A300428 * A300430 A300431 A300432

Keyword

nonn

Author

R. H. Hardin, Mar 05 2018

Status

approved