A215187 Number of 7X7X7 triangular 0..n arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value

2, 141, 1584, 36645, 364970, 3332921, 23336410, 143644981, 756744936, 3562883365, 15019874686, 58119516961, 206862317720, 687315946713, 2141261136428, 6308361172196, 17640556864702, 47119051969326, 120551657307564

Offset

1,1

Comments

Row 7 of A215182

Links

R. H. Hardin, Table of n, a(n) for n = 1..62

Example

Some solutions for n=4
........2..............2..............2..............2..............2
.......2.2............2.2............1.3............2.2............1.3
......2.2.2..........1.2.3..........1.2.3..........2.2.2..........0.3.3
.....0.1.3.4........1.1.3.3........0.2.3.3........1.1.3.3........0.1.3.4
....0.1.2.3.4......1.1.2.3.3......0.0.2.4.4......1.1.1.3.4......0.2.2.2.4
...0.1.1.2.4.4....1.1.2.2.2.4....0.1.2.2.3.4....0.0.0.4.4.4....0.0.2.3.3.4
..0.1.1.2.2.4.4..0.1.1.1.3.4.4..0.1.2.2.2.3.4..0.0.1.3.3.3.4..0.0.0.3.3.4.4

Crossrefs

Sequence in context: A334013 A115890 A356747 * A101827 A283097 A371588

Adjacent sequences: A215184 A215185 A215186 * A215188 A215189 A215190

Keyword

nonn

Author

R. H. Hardin Aug 05 2012

Status

approved