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 A235456 Number of non-equivalent (mod D_4) ways to arrange 5 points on an n X n square grid so that no three points are collinear. 6
 5, 217, 3192, 27041, 149217, 650566, 2317137, 7124316, 19459757, 48617666, 111797647, 241575473 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 COMMENTS Column 5 of A235453. Without the restriction "non-equivalent (mod D_4)" the numbers are given by A194190, n >= 3. LINKS Table of n, a(n) for n=3..14. EXAMPLE There are a(3) = 5 non-equivalent ways to place 5 points (X) on a 3 X 3 grid: X . X X . X . X X X X . X . X X . X X . . X . X X . . X X . . X . . X X . X . . X X . X . CROSSREFS Cf. A235453, A194190, A235454 (3 points), A235455 (4 points), A235457 (6 points), A235458 (7 points) Sequence in context: A206457 A291806 A119657 * A159808 A159317 A345465 Adjacent sequences: A235453 A235454 A235455 * A235457 A235458 A235459 KEYWORD nonn,more AUTHOR Heinrich Ludwig, Jan 12 2014 EXTENSIONS a(13), a(14) from Heinrich Ludwig, Nov 16 2016 STATUS approved

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Last modified June 25 11:18 EDT 2024. Contains 373701 sequences. (Running on oeis4.)