The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons 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 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A236785 Number of (n+1)X(4+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal 1
 2475, 19851, 145124, 1287919, 10951425, 101820364, 921870137, 8733287503, 81211467440, 774898990883, 7293638090037, 69775296750588, 660733874896417, 6326252988398973, 60109364320802748, 575636103622182519 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A236789 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE Some solutions for n=3 ..0..2..1..0..2....1..0..1..2..1....0..2..1..1..1....0..2..0..0..0 ..0..2..1..1..1....2..1..2..1..0....1..1..0..1..0....0..0..0..2..0 ..1..1..2..0..2....2..1..2..1..1....2..2..1..1..2....0..0..0..0..0 ..0..1..2..0..2....2..1..0..1..0....0..0..1..0..1....1..0..1..0..2 CROSSREFS Sequence in context: A183703 A282559 A278733 * A020411 A124594 A241048 Adjacent sequences:  A236782 A236783 A236784 * A236786 A236787 A236788 KEYWORD nonn AUTHOR R. H. Hardin, Jan 31 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 December 5 22:21 EST 2021. Contains 349558 sequences. (Running on oeis4.)