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A298378
Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.
1
1, 18, 18, 47, 172, 504, 1502, 5011, 16723, 55130, 184504, 619998, 2084868, 7024818, 23676837, 79847524, 269324641, 908631125, 3065973546, 10346238353, 34915387305, 117832494393, 397671686820, 1342113470626, 4529581358627
OFFSET
1,2
COMMENTS
Column 4 of A298382.
FORMULA
Empirical recurrence of order 71 (see link above)
EXAMPLE
Some solutions for n=7
..0..1..0..0. .0..0..1..1. .0..0..1..1. .0..0..0..0. .0..0..1..1
..0..0..0..1. .0..0..1..0. .0..1..1..0. .0..1..1..0. .0..0..1..0
..1..0..0..0. .1..1..1..1. .1..0..0..0. .0..1..0..1. .1..1..1..1
..0..0..1..0. .0..1..1..0. .1..0..1..0. .0..0..0..1. .0..1..1..0
..0..1..0..1. .1..1..0..0. .1..1..1..1. .0..1..1..0. .0..0..1..1
..0..1..1..1. .0..1..1..1. .0..1..1..0. .1..0..1..0. .1..1..1..0
..0..0..1..0. .1..1..0..1. .1..1..0..0. .1..1..0..0. .1..0..1..1
CROSSREFS
Cf. A298382.
Sequence in context: A040307 A022352 A211411 * A299245 A352365 A050686
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2018
STATUS
approved