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!)
A281951 Number of nX4 0..1 arrays with no element unequal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards. 1
8, 112, 587, 3389, 19089, 111354, 640778, 3716432, 21502354, 124531091, 721152740, 4176107752, 24184974414, 140057032575, 811098268642, 4697197830808, 27202297829372, 157533202227607, 912302039312046, 5283299749392401 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A281955.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +14*a(n-2) -45*a(n-3) -87*a(n-4) +179*a(n-5) +51*a(n-6) -197*a(n-7) +424*a(n-8) -224*a(n-9) -890*a(n-10) +887*a(n-11) +660*a(n-12) -788*a(n-13) -418*a(n-14) +178*a(n-15) +92*a(n-16) -27*a(n-17) +60*a(n-18) +69*a(n-19) +95*a(n-20) -a(n-21) -5*a(n-22) -45*a(n-23) -10*a(n-24) -9*a(n-25) -6*a(n-26) +3*a(n-28) for n>32

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281955.

Sequence in context: A131621 A239754 A003721 * A316179 A305765 A317114

Adjacent sequences:  A281948 A281949 A281950 * A281952 A281953 A281954

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 03 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 July 26 16:44 EDT 2021. Contains 346294 sequences. (Running on oeis4.)