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A300502
Number of nX4 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
5, 3, 7, 20, 32, 68, 191, 504, 1353, 4033, 11685, 33861, 98728, 286160, 829255, 2405240, 6971387, 20210591, 58596872, 169882747, 492538787, 1428005265, 4140151175, 12003425671, 34801083823, 100897399130, 292528300568
OFFSET
1,1
COMMENTS
Column 4 of A300506.
FORMULA
Empirical recurrence of order 93 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..0..1. .0..1..1..1. .0..0..0..1. .0..1..1..0. .0..1..1..1
..1..0..0..0. .0..0..1..1. .1..0..0..0. .0..0..0..1. .0..0..1..1
..1..1..0..0. .0..0..1..1. .1..1..0..0. .0..0..1..0. .0..0..1..0
..1..1..0..1. .0..0..1..1. .1..1..0..0. .1..0..0..1. .0..1..1..0
..0..1..0..1. .0..0..0..1. .1..1..1..0. .0..1..0..1. .0..1..1..1
CROSSREFS
Cf. A300506.
Sequence in context: A030679 A077891 A129735 * A248257 A019663 A187488
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 07 2018
STATUS
approved