The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A251020 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements 0
 110, 2546, 20608, 119632, 516684, 2160510, 7948184, 29146692, 100696896, 345190686, 1144782282, 3748752570, 12009496342, 37949629638 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A251028 LINKS EXAMPLE Some solutions for n=4 ..0..1..1..1..2....0..1..1..1..3....0..0..0..0..3....0..0..1..1..3 ..0..0..0..0..1....0..0..0..0..2....0..0..0..0..3....3..0..1..0..2 ..2..2..2..2..2....0..0..0..0..1....1..1..1..1..2....3..0..1..0..2 ..1..0..0..0..0....0..0..0..0..0....2..0..0..0..1....3..0..1..0..1 ..2..0..0..0..0....3..3..2..2..1....3..1..1..0..0....3..0..1..0..0 CROSSREFS Sequence in context: A205348 A008450 A163729 * A245876 A185536 A201833 Adjacent sequences: A251017 A251018 A251019 * A251021 A251022 A251023 KEYWORD nonn AUTHOR R. H. Hardin, Nov 29 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 22 14:44 EDT 2023. Contains 361430 sequences. (Running on oeis4.)