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!)
A302410 Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 17, 30, 120, 441, 1431, 4754, 16423, 55848, 188797, 641401, 2181141, 7403533, 25137442, 85383840, 289971604, 984703839, 3344148948, 11357024856, 38568809117, 130981523021, 444820935270, 1510634631331, 5130191496078 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A302415.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +2*a(n-2) +11*a(n-3) +a(n-4) -18*a(n-5) -14*a(n-6) -24*a(n-7) +52*a(n-8) -4*a(n-9) +8*a(n-10) -24*a(n-11) +24*a(n-12) -32*a(n-13)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302415.

Sequence in context: A163736 A249582 A127547 * A303177 A212756 A031040

Adjacent sequences:  A302407 A302408 A302409 * A302411 A302412 A302413

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 07 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 September 27 06:31 EDT 2021. Contains 347673 sequences. (Running on oeis4.)