A252073 Number of (n+2)X(6+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 or 4.

1573, 8352, 60245, 391934, 2547765, 16789564, 110131513, 722619033, 4749948377, 31181555206, 204626875063, 1343622742626, 8822820748320, 57923805951945, 380282422081555, 2496764092390189, 16392666023439258, 107625734028805523

Offset: 1

Author

R. H. Hardin, Dec 13 2014

Keywords

• nonn

Comments

Column 6 of A252075

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 72

Formula

Empirical recurrence of order 72 (see link above)