A240785 Number of 4Xn 0..1 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..1 introduced in row major order.

8, 34, 97, 305, 959, 3033, 9581, 30354, 96122, 304551, 964960, 3057691, 9689250, 30704176, 97298863, 308333649, 977091497, 3096352093, 9812187127, 31094352992, 98536547134, 312257747281, 989530396718, 3135776321313, 9937131194560

Offset: 1

Author

R. H. Hardin, Apr 12 2014

Keywords

• nonn

Comments

Row 4 of A240783

Examples

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

Links

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

Formula

Empirical: a(n) = 6*a(n-1) -11*a(n-2) +7*a(n-3) -10*a(n-5) +13*a(n-6) -3*a(n-7) +27*a(n-8) -44*a(n-9) +13*a(n-10) +5*a(n-11) -8*a(n-12) +8*a(n-13) -3*a(n-14) +a(n-15)