This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A211581 Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having one, two, three, four, five or six distinct values for every i,j,k<=n 1
 25, 125, 457, 1353, 3771, 10123, 26785, 70815, 187485, 501357, 1349215, 3674445, 10074585, 27914969, 77778359, 218513889, 616455627, 1749899177, 4982262575, 14249870589, 40844847989, 117464523359, 338353979903, 977015700789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..33 EXAMPLE Some solutions for n=5 .-2....1...-1....0....1...-2...-1....0....1....0....1....1....0...-1....0...-2 .-1....0....0...-1....0....1...-1....0....2....1....1...-1...-1....0....1....0 ..0....1...-1....1...-2....0...-1....2....1....2....1....1....1...-1....1...-1 .-2....0...-1...-1....0....1....1....0....0....1....1....0....1...-1....0...-2 ..0....0...-2...-2....1....0....1....2...-1....1...-1....0....1....0....0...-1 .-1....0...-1....0....2....0...-1....2...-2....1....1...-1....1....0...-2...-2 CROSSREFS Sequence in context: A044738 A062672 A036321 * A211595 A066609 A074006 Adjacent sequences:  A211578 A211579 A211580 * A211582 A211583 A211584 KEYWORD nonn AUTHOR R. H. Hardin Apr 16 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .