A230650 Number of nX6 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).

0, 33, 177, 2547, 28161, 337977, 3951657, 46564959, 547445439, 6440488155, 75754392573, 891094042215, 10481688337035, 123293830743177, 1450276232412603, 17059265522993919, 200664184001736495

Offset: 1

Author

R. H. Hardin, Oct 27 2013

Keywords

• nonn

Comments

Column 6 of A230652

Examples

			Some solutions for n=5
..1..x..2..x..0..x....1..x..1..x..2..x....1..x..2..x..2..x....2..x..0..x..1..x
..x..1..x..0..x..2....x..1..x..0..x..1....x..1..x..0..x..2....x..0..x..2..x..1
..2..x..1..x..0..x....0..x..1..x..1..x....2..x..2..x..0..x....2..x..1..x..1..x
..x..0..x..1..x..2....x..2..x..0..x..1....x..0..x..2..x..1....x..2..x..1..x..2
..2..x..2..x..0..x....0..x..2..x..1..x....2..x..0..x..1..x....0..x..1..x..0..x
		

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +50*a(n-2) -22*a(n-3) -437*a(n-4) -1133*a(n-5) -548*a(n-6) +2623*a(n-7) +5757*a(n-8) +6227*a(n-9) -194*a(n-10) -2664*a(n-11) -3827*a(n-12) +2327*a(n-13) -5991*a(n-14) -4452*a(n-15) -3865*a(n-16) -6535*a(n-17) -536*a(n-18) -639*a(n-19) -373*a(n-20) -29*a(n-21) +76*a(n-22) -16*a(n-23) for n>24