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!)
A252402 Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7 1
983, 774, 1515, 3302, 8346, 20998, 50675, 133296, 343447, 848007, 2263089, 5902801, 14734098, 39629269, 104070383, 261353804, 706017540, 1860981190, 4689050899, 12697106938, 33535406222, 84648673583, 229505457761, 606816472873 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A252407

LINKS

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

FORMULA

Empirical: a(n) = 32*a(n-3) -310*a(n-6) +1291*a(n-9) -4641*a(n-12) +11713*a(n-15) -20535*a(n-18) +26754*a(n-21) -23045*a(n-24) +8109*a(n-27) +1127*a(n-30) -638*a(n-33) +162*a(n-36) -12*a(n-39) -7*a(n-42) +a(n-45) for n>48

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A056937 A251839 A122472 * A087907 A182574 A096701

Adjacent sequences:  A252399 A252400 A252401 * A252403 A252404 A252405

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 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 October 20 10:00 EDT 2020. Contains 337900 sequences. (Running on oeis4.)