login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A301486 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
4, 18, 52, 148, 441, 1372, 4326, 13641, 42741, 133208, 414303, 1289070, 4015530, 12519594, 39044533, 121754095, 379591807, 1183290025, 3688511653, 11498007929, 35843459506, 111739411177, 348340800464, 1085925223300, 3385266114712 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A301491.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -22*a(n-2) +15*a(n-3) +44*a(n-4) -86*a(n-5) +a(n-6) +87*a(n-7) -13*a(n-8) -39*a(n-9) +19*a(n-10) -56*a(n-11) -26*a(n-12) +38*a(n-13) +90*a(n-14) +118*a(n-15) -46*a(n-16) -18*a(n-17) -120*a(n-18) -6*a(n-19) -15*a(n-20) +26*a(n-21) +3*a(n-23) -a(n-24) for n>25

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301491.

Sequence in context: A059133 A300493 A300876 * A284607 A297945 A320544

Adjacent sequences:  A301483 A301484 A301485 * A301487 A301488 A301489

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 22 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 April 23 07:51 EDT 2019. Contains 322381 sequences. (Running on oeis4.)