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A215176 Number of nXnXn triangular 0..2 arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value 1
3, 4, 5, 9, 17, 48, 141, 559, 2231, 11148, 55733, 334389, 2006325, 14044264, 98309837, 786478683, 6291829451, 56626465044, 509638185381, 5096381853793, 50963818537913, 560602003917024, 6166622043087245, 73999464517046919 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A215182

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..89

EXAMPLE

Some solutions for n=4

.....1........1........1........2........0........1........1........1

....1.1......1.1......1.1......2.2......0.0......1.1......0.2......1.1

...1.1.1....1.1.1....0.1.2....2.2.2....0.0.0....1.1.1....0.1.2....0.1.2

..0.0.2.2..0.1.1.2..0.0.2.2..2.2.2.2..0.0.0.0..1.1.1.1..0.0.2.2..0.1.1.2

CROSSREFS

Sequence in context: A000692 A195971 A080552 * A257041 A056797 A029727

Adjacent sequences:  A215173 A215174 A215175 * A215177 A215178 A215179

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2012

STATUS

approved

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Last modified October 21 20:51 EDT 2018. Contains 316428 sequences. (Running on oeis4.)