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!)
A252623 Number of (n+2)X(1+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 1 3 6 or 8 1
4508, 17704, 81098, 405044, 2130874, 11518022, 63438930, 353233466, 1976523666, 11088640448, 62315269254, 350508927020, 1972366177122, 11101445268642, 62493475929562, 351821536293274, 1980734034606622, 11151649389273578 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A252628

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A144490 A252470 A252628 * A023684 A105845 A107543

Adjacent sequences:  A252620 A252621 A252622 * A252624 A252625 A252626

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 19 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 January 20 08:12 EST 2021. Contains 340301 sequences. (Running on oeis4.)