A302947 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 86, 6531, 2104533, 2766909379, 13578993819785, 252836915021232264, 18036285050227905448214, 4921162186957679442128426852

Offset

1,2

Comments

Diagonal of A302953.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A302953.

Sequence in context: A292830 A185142 A279020 * A326948 A159053 A172494

Adjacent sequences: A302944 A302945 A302946 * A302948 A302949 A302950

Keyword

nonn

Author

R. H. Hardin, Apr 16 2018

Status

approved