A190096 Number of rhombuses on a (n+1)X8 grid.

7, 32, 82, 164, 273, 412, 564, 736, 918, 1112, 1306, 1520, 1734, 1960, 2198, 2448, 2698, 2964, 3230, 3508, 3790, 4084, 4378, 4684, 4996, 5320, 5644, 5980, 6316, 6664, 7012, 7372, 7732, 8104, 8480, 8868, 9256, 9656, 10056, 10468, 10880, 11304, 11728, 12164

Offset: 1

Author

R. H. Hardin May 04 2011

Keywords

• nonn

Comments

Column 7 of A190098

Examples

			Some solutions for n=3
..1..3....0..2....0..5....0..3....1..3....0..3....0..5....0..1....0..4....2..4
..1..5....1..1....1..3....1..5....2..0....0..6....1..4....1..3....0..7....2..5
..3..5....2..2....3..2....3..4....3..3....3..6....2..5....3..2....3..7....3..5
..3..3....1..3....2..4....2..2....2..6....3..3....1..6....2..0....3..4....3..4
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n) = 2*a(n-1) -2*a(n-3) +a(n-4) for n>51