This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A210312 Number of (n+1)X(n+1) 0..3 arrays containing all values 0..3 with every 2X2 subblock having two or three distinct values, and new values 0..3 introduced in row major order 0
 0, 4125, 58464712, 7415631633670, 11219641807667569855, 214148948714201593922295166, 51994819539384403072547129110683133, 160715710349516432110880775618321863607017118 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A210320 LINKS EXAMPLE Some solutions for n=4 ..0..0..0..0..0....0..0..1..2..0....0..0..0..0..1....0..0..0..1..1 ..1..1..1..0..1....2..2..1..2..0....0..1..2..2..0....1..1..2..2..3 ..0..2..0..0..2....0..1..0..2..2....2..0..0..0..1....0..3..3..0..0 ..1..1..0..1..0....0..1..3..2..0....2..3..2..3..1....3..3..0..2..1 ..0..1..0..3..3....0..0..0..2..0....1..1..3..3..3....0..1..0..1..1 CROSSREFS Sequence in context: A168462 A045032 A196896 * A125502 A168631 A117810 Adjacent sequences:  A210309 A210310 A210311 * A210313 A210314 A210315 KEYWORD nonn AUTHOR R. H. Hardin Mar 20 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 12 22:06 EST 2019. Contains 329963 sequences. (Running on oeis4.)