This site is supported by donations to The OEIS Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A243634 Number of length n+2 0..n arrays with no three unequal elements in a row and new values 0..n introduced in 0..n order. 2
 4, 9, 21, 51, 127, 324, 844, 2243, 6073, 16737, 46905, 133556, 386062, 1132107, 3365627, 10137559, 30920943, 95457178, 298128278, 941574417, 3006040523, 9697677885, 31602993021, 104001763258, 345524136076, 1158570129917 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A243641. LINKS R. H. Hardin, Table of n, a(n) for n = 1..209 EXAMPLE Some solutions for n=6 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0 ..1....1....0....1....1....1....1....1....0....1....0....1....1....0....1....0 ..1....0....1....0....1....1....1....1....1....0....0....0....1....1....0....1 ..1....1....1....0....2....0....2....1....1....1....1....0....0....0....1....1 ..2....1....0....0....1....1....2....1....1....0....1....1....0....0....1....1 ..2....2....0....0....1....0....1....2....2....0....1....1....2....1....2....1 ..2....1....2....1....3....0....1....2....2....2....1....1....2....1....2....0 ..2....1....2....0....3....1....1....1....2....0....0....0....1....0....1....0 CROSSREFS Cf. A247100. Sequence in context: A243638 A243639 A243640 * A076861 A048391 A041743 Adjacent sequences:  A243631 A243632 A243633 * A243635 A243636 A243637 KEYWORD nonn AUTHOR R. H. Hardin, Jun 08 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.

Last modified January 17 19:58 EST 2019. Contains 319251 sequences. (Running on oeis4.)