login
A299217
Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
2
1, 37, 81, 427, 2338, 13458, 84948, 543741, 3534493, 23192676, 152386263, 1003140993, 6609135301, 43551719814, 287046844098, 1892053858627, 12471668276710, 82210001337166, 541910867484011, 3572172049448373
OFFSET
1,2
COMMENTS
Column 4 of A299221.
FORMULA
Empirical recurrence of order 66 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..1..1. .0..1..1..0. .0..1..0..1. .0..0..0..1. .0..1..1..0
..0..0..1..0. .1..1..0..0. .1..1..0..0. .1..0..1..1. .1..1..1..1
..0..1..1..1. .1..0..0..1. .1..1..0..0. .1..1..0..1. .1..1..1..0
..0..1..0..0. .1..0..0..0. .0..0..1..1. .0..1..0..1. .0..0..1..1
..0..0..0..1. .1..1..0..0. .0..0..1..0. .0..0..1..1. .0..1..1..1
CROSSREFS
Cf. A299221.
Sequence in context: A141895 A262566 A323428 * A172193 A141918 A063325
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2018
STATUS
approved