A301878 Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

1, 5, 29, 203, 1961, 46079, 1454613, 62334085, 3652793090, 396573816796, 69941377742308, 18134969889221510, 6588551772384992388, 3921248690493143791628, 3850994691538742533588713

Offset

1,2

Comments

Diagonal of A301884.

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Cf. A301884.

Sequence in context: A004213 A350476 A105277 * A331798 A103213 A057588

Adjacent sequences: A301875 A301876 A301877 * A301879 A301880 A301881

Keyword

nonn

Author

R. H. Hardin, Mar 28 2018

Status

approved