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!)
A222749 Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 2
0, 6, 32, 657, 7546, 124363, 1710608, 26389570, 386047246, 5871176993, 88003925336, 1338216528014, 20289648960772, 309520117240045, 4723512898829824, 72313201073502649, 1108352818885158958 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A222747

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

EXAMPLE

Some solutions for n=3

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

..0..2..1....0..0..1....2..2..3....1..1..0....0..1..0....1..2..3....1..1..2

CROSSREFS

Sequence in context: A296314 A222605 A290790 * A132548 A140521 A171141

Adjacent sequences:  A222746 A222747 A222748 * A222750 A222751 A222752

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 04 2013

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 October 20 10:43 EDT 2021. Contains 348100 sequences. (Running on oeis4.)