A281950 Number of nX3 0..1 arrays with no element unequal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards.

4, 30, 133, 587, 2559, 11251, 49293, 216274, 948407, 4159753, 18243646, 80014078, 350927303, 1539109339, 6750270615, 29605549628, 129844926004, 569477896562, 2497633716174, 10954199079473, 48043264384017, 210709631957358

Offset

1,1

Comments

Column 3 of A281955.

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +7*a(n-2) -3*a(n-3) -5*a(n-4) +2*a(n-5) +2*a(n-6) -12*a(n-7) +2*a(n-8) -3*a(n-10) for n>12

Example

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

Crossrefs

Cf. A281955.

Sequence in context: A027789 A130424 A005715 * A316178 A375260 A305764

Adjacent sequences: A281947 A281948 A281949 * A281951 A281952 A281953

Keyword

nonn

Author

R. H. Hardin, Feb 03 2017

Status

approved