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!)
A204393 Number of (n+2)X5 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order 1
2952, 27378, 259808, 2196608, 19698336, 174658050, 1547710600, 13756760192, 122079933752, 1083689364402, 9620166188160, 85392166564352, 758008400004000, 6728631286807682, 59728099395382600, 530190438800064512 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A204398
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) -98*a(n-3) +a(n-4) +816*a(n-5) +1344*a(n-6) -20144*a(n-7) +33980*a(n-8) -153384*a(n-9) +165632*a(n-10) +118472*a(n-11) +123156*a(n-12) -307376*a(n-13) +93760*a(n-14) +1424560*a(n-15) -1230622*a(n-16) +5645436*a(n-17) -7141376*a(n-18) -7542860*a(n-19) +1618414*a(n-20) -161200*a(n-21) +1428928*a(n-22) +1374768*a(n-23) -638900*a(n-24) -9196456*a(n-25) +9826560*a(n-26) +9895368*a(n-27) -2398428*a(n-28) -1196496*a(n-29) +278208*a(n-30) +162000*a(n-31) -64233*a(n-32) -38070*a(n-33) -5346*a(n-35) +729*a(n-36) for n>37
EXAMPLE
Some solutions for n=3
..0..1..1..0..0....0..1..1..1..0....0..0..1..0..0....0..1..0..1..1
..1..1..0..0..0....1..1..1..1..0....0..1..0..1..1....1..1..0..1..1
..0..1..1..1..1....0..0..1..0..0....0..1..0..1..0....1..0..0..0..0
..1..0..0..0..1....0..0..1..0..0....1..0..0..1..1....1..0..1..0..1
..1..0..1..0..1....1..1..1..1..0....1..0..1..1..0....1..1..1..0..1
CROSSREFS
Sequence in context: A177087 A125907 A025514 * A178273 A289562 A054833
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 21 15:14 EDT 2024. Contains 374474 sequences. (Running on oeis4.)