A224387 Number of nX4 0..3 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.

35, 1225, 27790, 497958, 8573507, 152271025, 2780848289, 51325449985, 949582166068, 17572045403455, 325249748226217, 6022221071267123, 111533443784218247, 2065901802649317374, 38268294526698715055

Offset: 1

Author

R. H. Hardin Apr 05 2013

Keywords

• nonn

Comments

Column 4 of A224391

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 47

Formula

Empirical recurrence of order 47 (see link above)