A301878 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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