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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A208878 Number of 7Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors 1
 715, 5826959, 40380275500, 271499374919883, 1820216057105650386, 12201956787655438957014, 81798476241280856702695038, 548357000894509223687629476021, 3676054154412185019451007694406065 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 7 of A208872 LINKS R. H. Hardin, Table of n, a(n) for n = 1..18 EXAMPLE Some solutions for n=4 ..0..0..0..0....0..1..0..0....0..0..0..1....0..0..0..1....0..0..0..0 ..1..2..1..1....1..0..1..2....1..1..0..0....1..1..2..1....1..1..1..1 ..1..0..2..1....1..2..0..0....0..1..2..1....2..1..0..3....0..2..3..3 ..3..3..1..2....3..1..3..0....3..1..3..0....2..3..0..0....3..2..0..0 ..0..2..3..1....1..0..1..3....0..1..0..2....0..2..1..3....3..0..2..0 ..2..0..0..1....2..3..1..3....0..1..0..2....2..0..1..0....2..3..3..0 ..0..2..2..0....2..2..1..1....0..1..1..1....2..0..1..2....0..0..3..2 CROSSREFS Sequence in context: A223061 A208863 A208871 * A208174 A200800 A208200 Adjacent sequences: A208875 A208876 A208877 * A208879 A208880 A208881 KEYWORD nonn AUTHOR R. H. Hardin Mar 02 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)