login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A281534 Number of nX2 0..2 arrays with no element equal to more than one of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 1
0, 0, 4, 104, 612, 3056, 16368, 82656, 397040, 1873344, 8687872, 39621504, 178384960, 794593024, 3506334976, 15347019264, 66696520448, 288032791552, 1236901206016, 5284853921792, 22477522539520, 95205886291968 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A281540.

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) -54*a(n-2) +136*a(n-3) -324*a(n-4) +720*a(n-5) -1064*a(n-6) +1632*a(n-7) -2208*a(n-8) +2048*a(n-9) -1920*a(n-10) +1536*a(n-11) -512*a(n-12)

EXAMPLE

Some solutions for n=4

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

..2..0. .0..2. .1..2. .0..1. .0..1. .0..2. .1..2. .0..2. .2..1. .0..1

..0..1. .2..0. .1..0. .2..0. .2..1. .0..2. .2..1. .2..0. .1..2. .0..1

..1..0. .2..1. .2..1. .0..2. .0..1. .0..1. .0..2. .1..0. .0..2. .2..2

CROSSREFS

Cf. A281540.

Sequence in context: A102439 A331456 A211150 * A006415 A333434 A181396

Adjacent sequences:  A281531 A281532 A281533 * A281535 A281536 A281537

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 23 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 November 29 14:52 EST 2020. Contains 338769 sequences. (Running on oeis4.)