login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A318210 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
2, 10, 21, 69, 245, 698, 2321, 7528, 24531, 80826, 263430, 865328, 2842893, 9337446, 30698901, 100854560, 331565806, 1089746855, 3582297494, 11775723803, 38708636705, 127247937304, 418290582504, 1375050737435, 4520146432969 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A318214.

LINKS

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

EXAMPLE

Some solutions for n=5

..0..1..0..1. .0..0..0..1. .0..1..0..1. .0..1..0..1. .0..1..1..0

..1..1..1..0. .1..0..0..1. .1..1..1..1. .1..1..1..1. .1..1..0..1

..1..1..1..1. .0..0..0..1. .0..1..0..0. .1..0..1..0. .1..1..1..1

..0..0..1..0. .0..1..1..1. .1..1..0..1. .0..0..0..0. .0..1..1..0

..0..1..1..1. .1..0..1..0. .0..0..0..0. .0..1..0..1. .1..0..1..1

CROSSREFS

Cf. A318214.

Sequence in context: A231376 A304700 A318548 * A080881 A138298 A303294

Adjacent sequences:  A318207 A318208 A318209 * A318211 A318212 A318213

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 21 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 9 19:47 EDT 2021. Contains 343746 sequences. (Running on oeis4.)