The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A206004 Number of (n+1) X 3 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to one, and every 2 X 2 determinant nonzero. 1
 78, 300, 980, 3706, 12304, 45810, 154346, 567112, 1932816, 7031026, 24170780, 87268194, 301959592, 1084079204, 3769438358, 13475470000, 47028047126, 167585570856, 586477834058, 2084911242168, 7311507381518, 25945246790130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A206010. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) + 13*a(n-2) - 17*a(n-3) - 34*a(n-4) - 9*a(n-5) + 23*a(n-6) + a(n-7) - 4*a(n-8) + a(n-9). Empirical g.f.: 2*x*(39 + 72*x - 317*x^2 - 414*x^3 - 48*x^4 + 293*x^5 + x^6 - 48*x^7 + 13*x^8) / (1 - 2*x - 13*x^2 + 17*x^3 + 34*x^4 + 9*x^5 - 23*x^6 - x^7 + 4*x^8 - x^9). - Colin Barker, Jun 13 2018 EXAMPLE Some solutions for n=4: ..1..0..2....2..2..1....2..1..2....1..0..1....1..2..2....2..0..2....0..2..0 ..1..1..1....2..1..1....0..1..1....1..1..1....1..1..2....2..2..2....1..2..2 ..2..1..2....2..2..0....1..1..2....1..2..1....0..1..1....0..1..2....1..1..2 ..2..2..2....0..2..2....2..1..1....1..1..1....1..1..0....1..1..1....0..1..1 ..1..2..1....1..1..2....2..0..1....1..2..0....0..1..2....0..1..0....1..1..0 CROSSREFS Cf. A206010. Sequence in context: A068130 A118938 A362546 * A317412 A231393 A231461 Adjacent sequences: A206001 A206002 A206003 * A206005 A206006 A206007 KEYWORD nonn AUTHOR R. H. Hardin, Feb 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 May 25 03:39 EDT 2024. Contains 372782 sequences. (Running on oeis4.)