This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A234354 Number of non-equivalent (mod D_3) ways to arrange 6 indistinguishable points on a triangular grid of side n so that no three points are collinear. 4
 1, 47, 1112, 11743, 82988, 433372, 1820163, 6459496, 20287372, 57129426, 147915285, 356109110, 804785159, 1722171831 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,2 COMMENTS Column 6 of triangle A234350. Without the restriction "non-equivalent (mod D_3)" the numbers are given by A194134. LINKS EXAMPLE There is a(4) = 1 non-equivalent way to arrange 6 indistinguishable points (x) on a triangular grid of side 4:      .     x x    x . x   . x x . CROSSREFS Cf. A234350, A194134 Arranging 3 points: A234351 Arranging 4 points: A234352 Arranging 5 points: A234353 Sequence in context: A009054 A012018 A010963 * A161692 A162191 A162456 Adjacent sequences:  A234351 A234352 A234353 * A234355 A234356 A234357 KEYWORD nonn,more AUTHOR Heinrich Ludwig, Dec 30 2013 EXTENSIONS a(14)-a(17) from Heinrich Ludwig, Apr 19 2016 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 April 24 10:41 EDT 2019. Contains 322424 sequences. (Running on oeis4.)