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A298149
Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
1
3, 4, 6, 18, 15, 104, 227, 510, 2020, 4986, 13983, 45252, 121009, 355706, 1066100, 2988274, 8793219, 25704770, 73650585, 215512322, 625817974, 1809132934, 5271836919, 15292220940, 44347166183, 128947693186, 374125678734
OFFSET
1,1
COMMENTS
Column 3 of A298154.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) +10*a(n-3) -28*a(n-4) -18*a(n-5) -8*a(n-6) +63*a(n-7) +42*a(n-8) -52*a(n-9) +9*a(n-10) +26*a(n-11) -23*a(n-12) -43*a(n-13) -11*a(n-14) -20*a(n-15) +9*a(n-16) +18*a(n-17) +2*a(n-18) for n>19
EXAMPLE
Some solutions for n=7
..0..1..0. .0..1..0. .0..0..1. .0..1..1. .0..0..1. .0..1..0. .0..0..0
..0..1..0. .1..1..1. .0..0..1. .0..1..1. .0..0..1. .1..1..1. .0..0..0
..0..0..0. .0..1..0. .0..1..1. .1..1..0. .1..1..1. .0..1..0. .0..0..0
..1..0..1. .1..1..0. .0..1..0. .0..1..1. .0..0..1. .1..1..0. .1..1..1
..1..0..1. .0..1..1. .1..1..0. .1..1..0. .0..0..1. .1..0..0. .1..1..1
..0..0..0. .1..1..0. .0..1..1. .0..1..1. .0..1..1. .1..1..0. .1..1..1
..0..0..1. .1..1..0. .0..1..1. .0..1..1. .0..1..1. .1..1..0. .1..1..1
CROSSREFS
Cf. A298154.
Sequence in context: A122849 A068573 A138577 * A136242 A066732 A304679
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2018
STATUS
approved