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!)
A213696 Half the number of (n+1)X(n+1) symmetric 0..7 arrays with no 2X2 subblock summing to 14 0
240, 105856, 342943680, 8159542628448, 1425762604012263360, 1829651398830137742302620 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A213697

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..0..0..7..0..4....4..0..7..0..1....0..2..3..7..0....0..4..1..2..0

..0..1..5..1..7....0..1..2..4..2....2..1..2..3..2....4..3..3..4..5

..7..5..4..7..2....7..2..6..1..4....3..2..7..5..1....1..3..0..5..2

..0..1..7..4..4....0..4..1..7..6....7..3..5..1..0....2..4..5..1..5

..4..7..2..4..3....1..2..4..6..2....0..2..1..0..7....0..5..2..5..0

CROSSREFS

Sequence in context: A052263 A218514 A270054 * A275459 A035281 A008696

Adjacent sequences:  A213693 A213694 A213695 * A213697 A213698 A213699

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 18 2012

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 25 13:05 EDT 2021. Contains 346290 sequences. (Running on oeis4.)