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!)
A283687 Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors. 1
16, 161, 1521, 15226, 150497, 1489917, 14754038, 146079023, 1446386879, 14321176544, 141798827829, 1403999090083, 13901477028478, 137643299572877, 1362853595880357, 13494081631456544, 133609537897145821 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A283691.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +24*a(n-2) +55*a(n-3) -57*a(n-4) -195*a(n-5) -458*a(n-6) +154*a(n-7) +630*a(n-8) +634*a(n-9) -160*a(n-10) -239*a(n-11) -42*a(n-12) -20*a(n-13) -8*a(n-14)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283691.

Sequence in context: A204297 A000811 A041484 * A011551 A238533 A085538

Adjacent sequences:  A283684 A283685 A283686 * A283688 A283689 A283690

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 14 2017

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 June 6 01:16 EDT 2020. Contains 334858 sequences. (Running on oeis4.)