login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A252562 Number of (4+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7 1
1265, 3084, 10585, 24336, 104515, 386004, 902276, 3886119, 14439854, 33740636, 145226515, 541433298, 1264809720, 5437258963, 20326627042, 47472999320, 203838402331, 764011813890, 1783974607832, 7651263017251, 28749096631362 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A252558

LINKS

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

FORMULA

Empirical: a(n) = 78*a(n-3) -1701*a(n-6) +7656*a(n-9) -30460*a(n-12) +70284*a(n-15) -70416*a(n-18) +25968*a(n-21) -1408*a(n-24) for n>30

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A237327 A233887 A234147 * A038652 A204720 A204959

Adjacent sequences:  A252559 A252560 A252561 * A252563 A252564 A252565

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 18 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 9 07:42 EDT 2022. Contains 356019 sequences. (Running on oeis4.)