A280858 Number of nX7 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.

224, 6596, 1698, 1005, 968, 1202, 1738, 2877, 5244, 9569, 15872, 24653, 36954, 55077, 83190, 128817, 204084, 326793, 522262, 828099, 1300592, 2029441, 3159306, 4927841, 7712840, 12114811, 19061740, 29999825, 47157384, 74031085, 116080358

Offset: 1

Author

R. H. Hardin, Jan 09 2017

Keywords

• nonn

Comments

Column 7 of A280859.

Examples

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

Links

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

Crossrefs

Cf. A280859.

Formula

Empirical: a(n) = a(n-1) +a(n-2) -a(n-3) +a(n-4) -a(n-5) +2*a(n-6) -a(n-7) +6*a(n-8) -4*a(n-9) -4*a(n-12) -a(n-13) -2*a(n-14) -3*a(n-15) -3*a(n-16) +3*a(n-17) -3*a(n-18) +a(n-19) -a(n-20) +2*a(n-23) for n>29