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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A302890 Number of 3Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 2, 37, 53, 197, 818, 2548, 10926, 42671, 176119, 742413, 3138038, 13445806, 57784846, 249318271, 1078199427, 4668892009, 20238323768, 87777824464, 380862666946, 1652959447763, 7175063435815, 31148370485509, 135230298285690 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A302889.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -5*a(n-2) -39*a(n-3) +8*a(n-4) +198*a(n-5) -56*a(n-6) -411*a(n-7) +6*a(n-8) +646*a(n-9) -35*a(n-10) -602*a(n-11) +26*a(n-12) +413*a(n-13) -25*a(n-14) -114*a(n-15) -18*a(n-16) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A302889.

Sequence in context: A086482 A078758 A102015 * A307974 A303625 A123850

Adjacent sequences:  A302887 A302888 A302889 * A302891 A302892 A302893

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 15 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 November 14 09:51 EST 2019. Contains 329111 sequences. (Running on oeis4.)