A301321 Number of nX6 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

32, 383, 735, 1709, 3649, 7600, 15802, 33150, 70311, 150532, 324443, 702447, 1525146, 3317041, 7221520, 15731216, 34280366, 74716439, 162869203, 355053284, 774048171, 1687544827, 3679181851, 8021454454, 17488766770, 38130129567

Offset

1,1

Comments

Column 6 of A301323.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 5*a(n-1) -8*a(n-2) +4*a(n-3) +2*a(n-7) -2*a(n-8) -3*a(n-9) +5*a(n-10) -a(n-11) -a(n-12) -a(n-14) +a(n-15) for n>19

Example

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

Crossrefs

Cf. A301323.

Sequence in context: A163690 A268999 A280602 * A300496 A300935 A300879

Adjacent sequences: A301318 A301319 A301320 * A301322 A301323 A301324

Keyword

nonn

Author

R. H. Hardin, Mar 18 2018

Status

approved