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!)
 A219581 Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 4Xn array 1
 20, 181, 2234, 18564, 140884, 1052190, 7579137, 51585784, 331270888, 2024909124, 11885134942, 67329174131, 369027185265, 1959956349517, 10103702621330, 50645615019582, 247273236084923, 1177685989979054, 5478135751536604 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A219578 LINKS R. H. Hardin, Table of n, a(n) for n = 1..110 EXAMPLE Some solutions for n=3 ..2..2..0....1..0..0....0..0..0....2..1..1....2..1..1....0..0..0....0..0..0 ..3..0..0....0..0..0....1..0..0....1..1..1....3..2..1....0..0..0....0..0..0 ..3..0..0....2..0..0....3..0..0....2..1..1....3..2..2....1..0..0....0..0..0 ..3..1..0....1..0..0....3..2..0....3..2..1....3..2..2....1..2..1....3..3..0 CROSSREFS Sequence in context: A091983 A037250 A000144 * A177073 A211153 A210429 Adjacent sequences:  A219578 A219579 A219580 * A219582 A219583 A219584 KEYWORD nonn AUTHOR R. H. Hardin Nov 23 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 November 30 17:04 EST 2021. Contains 349424 sequences. (Running on oeis4.)