A224020 Number of nX4 0..3 arrays with rows nondecreasing and antidiagonals unimodal.

35, 1225, 32523, 772683, 17735200, 403836633, 9186127249, 208983591829, 4754911670136, 108190494364824, 2461721043138176, 56012981686098087, 1274495739407259502, 28999333370466443973, 659838457829407289280

Offset: 1

Author

R. H. Hardin Mar 30 2013

Keywords

• nonn

Comments

Column 4 of A224024

Examples

			Some solutions for n=3
..2..2..3..3....0..1..1..1....0..0..0..1....0..1..2..3....0..1..1..1
..2..2..3..3....0..2..2..3....0..0..1..2....0..0..3..3....1..3..3..3
..1..1..2..3....0..0..0..0....0..0..1..1....0..2..3..3....2..3..3..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 35*a(n-1) -347*a(n-2) +1689*a(n-3) -2986*a(n-4) -2311*a(n-5) +23532*a(n-6) -23864*a(n-7) -36468*a(n-8) +100464*a(n-9) +94080*a(n-10)