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!)
A318087 Number of nX4 0..1 arrays with every element unequal to 0, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1

%I

%S 1,3,7,47,159,547,1976,8031,32040,126847,497430,1956777,7702762,

%T 30347033,119531416,470732127,1853881221,7300825094,28753367787,

%U 113237861964,445967783236,1756341155437,6916999603444,27241103834694,107283461298615

%N Number of nX4 0..1 arrays with every element unequal to 0, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 4 of A318091.

%H R. H. Hardin, <a href="/A318087/b318087.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..0..1..1..0. .0..1..1..1. .0..1..1..0. .0..0..1..1. .0..1..1..0

%e ..1..0..1..0. .1..0..0..0. .1..0..1..1. .0..1..0..0. .1..0..1..1

%e ..1..0..0..1. .0..0..0..1. .0..1..0..0. .1..1..1..0. .0..1..0..1

%e ..1..0..0..1. .1..1..1..0. .0..0..0..1. .0..0..0..1. .1..1..0..0

%e ..1..0..1..0. .0..1..0..0. .1..0..1..0. .1..0..1..0. .0..1..0..1

%Y Cf. A318091.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 16 2018

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 October 15 18:40 EDT 2021. Contains 348033 sequences. (Running on oeis4.)