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!)
A250908 Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element 1
4909, 297873, 18077319, 1096982379, 66566704705, 4039362762435, 245114118899485, 14873861407326111, 902566310928490467, 54768961329136851033, 3323455667098397402917, 201671846608424737679469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A250913

LINKS

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

FORMULA

Empirical: a(n) = 74*a(n-1) -825*a(n-2) +1101*a(n-3) -4926*a(n-4) +231*a(n-5) +1684*a(n-6) +736*a(n-7)

EXAMPLE

Some solutions for n=1

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

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

CROSSREFS

Sequence in context: A168028 A031834 A031634 * A179144 A036530 A088069

Adjacent sequences:  A250905 A250906 A250907 * A250909 A250910 A250911

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 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 23 20:39 EST 2021. Contains 340386 sequences. (Running on oeis4.)