A202652 Number of 3X3 0..n arrays with no row or column sum equal to the previous.

126, 8460, 143028, 1217196, 6835050, 29025832, 100804408, 300779112, 797002582, 1919734900, 4275569868, 8918598788, 17597763122, 33103533936, 59741213696, 103962922160, 175195148094, 286904314092, 457948263108, 714267962604

Offset: 1

Author

R. H. Hardin Dec 22 2011

Keywords

• nonn

Comments

Row 3 of A202651

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..33

Formula

Empirical: a(n) = 5*a(n-1) -6*a(n-2) -9*a(n-3) +24*a(n-4) -3*a(n-5) -26*a(n-6) +7*a(n-7) +18*a(n-8) +7*a(n-9) -26*a(n-10) -3*a(n-11) +24*a(n-12) -9*a(n-13) -6*a(n-14) +5*a(n-15) -a(n-16)