A213700 Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n.

529, 750261, 109820000, 4286833981, 83545858925, 976919547736, 8159542628448, 51964311225934, 271341777491743, 1197645088919101, 4637119560078960, 16013821321719463, 50395763900241707, 145985579644461562

Offset: 1

Author

R. H. Hardin Jun 18 2012

Keywords

• nonn

Comments

Row 4 of A213697

Examples

			Some solutions for n=4
..0..3..2..3..4....3..0..0..1..4....0..4..0..2..3....0..1..2..2..4
..3..4..3..1..3....0..2..3..1..1....4..2..0..3..3....1..2..4..1..0
..2..3..4..2..4....0..3..2..4..3....0..0..4..3..1....2..4..2..3..1
..3..1..2..4..1....1..1..4..1..4....2..3..3..2..0....2..1..3..1..4
..4..3..4..1..1....4..1..3..4..3....3..3..1..0..4....4..0..1..4..4
		

Links

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