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A194022 Number of ways to arrange 8 points on an n X n X n triangular grid on an isosceles triangle so that it balances at the midpoint of its central altitude. 1
0, 0, 0, 0, 21, 560, 6425, 47385, 262382, 1180469, 4530030, 15317274, 46696163, 130554918, 339126948, 826821895, 1907572610, 4192279515, 8824669582, 17873749440, 34969097933, 66304228516, 122186400487, 219382723103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Column 8 of A194024.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

Some solutions for 5 X 5 X 5:

......1..........1..........1..........1..........1..........1..........1

.....1.1........1.1........1.1........1.1........1.1........1.0........1.1

....0.1.1......1.1.0......1.1.0......0.1.1......1.0.1......1.1.1......0.1.1

...1.0.0.1....0.0.1.1....1.0.0.1....0.1.1.0....1.0.1.0....1.0.1.1....0.1.0.1

..0.1.0.0.0..0.1.0.0.0..0.0.0.1.0..0.1.0.0.0..0.0.0.1.0..0.0.0.0.0..1.0.0.0.0

CROSSREFS

Sequence in context: A034789 A297635 A292062 * A183730 A341572 A199254

Adjacent sequences:  A194019 A194020 A194021 * A194023 A194024 A194025

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 12 2011

STATUS

approved

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Last modified October 19 16:25 EDT 2021. Contains 348091 sequences. (Running on oeis4.)