login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A320398 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
8, 97, 732, 5956, 46516, 368049, 2908839, 22987303, 181744907, 1436461093, 11355392249, 89758535679, 709518658622, 5608497091251, 44333394421956, 350441036671961, 2770122870971545, 21896924058038922, 173088084934645189 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A320402.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +28*a(n-2) -24*a(n-3) -136*a(n-4) +105*a(n-5) -107*a(n-6) -286*a(n-7) -1000*a(n-8) +3256*a(n-9) -4082*a(n-10) +3419*a(n-11) -4880*a(n-12) +9893*a(n-13) +2718*a(n-14) +2078*a(n-15) +375*a(n-16) +9428*a(n-17) +6871*a(n-18) -13907*a(n-19) -47584*a(n-20) -33040*a(n-21) +3344*a(n-22) +35603*a(n-23) +39192*a(n-24) +3067*a(n-25) -15105*a(n-26) -15565*a(n-27) -3783*a(n-28) +6868*a(n-29) +3565*a(n-30) +414*a(n-31) -1909*a(n-32) -770*a(n-33) +339*a(n-34) +213*a(n-35) +64*a(n-36) -62*a(n-37) -13*a(n-38) +10*a(n-39) -a(n-40) for n>41

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A320402.

Sequence in context: A317005 A002506 A318012 * A218451 A262777 A292747

Adjacent sequences:  A320395 A320396 A320397 * A320399 A320400 A320401

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 12 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 January 25 23:56 EST 2022. Contains 350572 sequences. (Running on oeis4.)