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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A235423 Number of (3+1)X(n+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise 0
2304, 60231, 1607343, 33361964, 681329430, 11371435264, 191226875455, 2693722807642, 38797084056738, 475948685808390, 6010295272057196, 65600903066982746, 737945948050343658, 7275182009966196680 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A235421

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A177759 A218431 A187292 * A235419 A229698 A236280

Adjacent sequences:  A235420 A235421 A235422 * A235424 A235425 A235426

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2014

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 December 13 06:26 EST 2019. Contains 329968 sequences. (Running on oeis4.)