login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

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
OFFSET
1,5
COMMENTS
Column 8 of A194024.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 12 2011
STATUS
approved