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!)
A257014 Number of (n+2)X(1+2) 0..2 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum 1
15066, 311364, 6508512, 136048896, 2834352000, 59049000000, 1231525944000, 25684705088064, 535477332658752, 11163685656822336, 232773660245307456, 4853556304757222976, 101196180631622776896, 2109930601689036657216 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A257017
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) +2592*a(n-3) +40824*a(n-4) +192456*a(n-5) +1679616*a(n-6) -90699264*a(n-8) -272097792*a(n-9)
EXAMPLE
Some solutions for n=1
..1..1..2....1..2..0....1..0..0....0..0..0....2..0..2....2..0..1....1..1..2
..2..1..1....0..0..0....2..0..0....1..2..2....2..2..2....2..0..0....0..2..2
..2..2..0....0..0..0....0..1..1....2..1..1....0..2..1....0..0..2....0..1..2
CROSSREFS
Sequence in context: A186215 A347077 A257017 * A237335 A206410 A283527
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 14 2015
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 March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)