A231941 Number of 2 X n 0..3 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.

16, 84, 668, 5070, 42104, 326010, 2511252, 19430715, 152135920, 1190465282, 9289762532, 72404777123, 564819519982, 4409093385085, 34418864675001, 268626308705377, 2096420912100320, 16362151427663928, 127710770440282286

Offset: 1

Author

R. H. Hardin, Nov 15 2013

Keywords

• nonn

Comments

Row 2 of A231940.

Examples

			Some solutions for n=7
..0..0..0..0..0..2..3....0..0..3..0..1..0..0....0..0..2..2..1..1..2
..2..0..0..0..3..1..1....0..0..0..0..0..2..0....0..0..1..3..1..1..3
		

Links

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

Crossrefs

Cf. A231940.

Formula

Empirical: a(n) = 16*a(n-1) -86*a(n-2) +190*a(n-3) +319*a(n-4) -4988*a(n-5) +10423*a(n-6) +3869*a(n-7) -14328*a(n-8) +132748*a(n-9) -44748*a(n-10) -130980*a(n-11) -63336*a(n-12) -493560*a(n-13) -373248*a(n-14) -51840*a(n-15).