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!)
A252960 Number of (n+2)X(7+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order 1
7495, 1069, 1429, 2349, 4019, 6855, 12573, 23471, 42337, 81323, 155799, 290009, 563689, 1097993, 2074061, 4075537, 7986375, 15324923, 30226561, 59683643, 115596469, 229227527, 454031043, 887656421, 1763720581, 3506651437 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A252961

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..183

FORMULA

Empirical: a(n) = 3*a(n-1) +a(n-2) +3*a(n-3) -30*a(n-4) -12*a(n-5) +67*a(n-6) +51*a(n-7) +41*a(n-8) -341*a(n-9) +162*a(n-10) -28*a(n-11) +261*a(n-12) -195*a(n-13) -9*a(n-14) +73*a(n-15) -30*a(n-16) +8*a(n-17) -71*a(n-18) +45*a(n-19) -a(n-20) +9*a(n-21) -6*a(n-22) for n>25

EXAMPLE

Some solutions for n=2

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

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

..4..4..0..0..1..0..0..2..0....3..3..1..3..3..1..3..3..2

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

CROSSREFS

Sequence in context: A250239 A330713 A253338 * A258612 A258605 A258604

Adjacent sequences:  A252957 A252958 A252959 * A252961 A252962 A252963

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 25 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 November 29 14:50 EST 2021. Contains 349416 sequences. (Running on oeis4.)