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A298144
Number of nX6 0..1 arrays with every element equal to 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
1
0, 5, 6, 27, 57, 92, 161, 369, 918, 2023, 4177, 9191, 20759, 46792, 104465, 235137, 529925, 1193122, 2683847, 6045698, 13629713, 30735537, 69313806, 156362148, 352814464, 796207260, 1796997548, 4056249123, 9156943844, 20673527694
OFFSET
1,2
COMMENTS
Column 6 of A298146.
FORMULA
Empirical recurrence of order 99 (see link above)
EXAMPLE
Some solutions for n=7
..0..0..1..0..1..1. .0..0..1..0..1..1. .0..0..1..1..1..1. .0..0..1..0..0..0
..0..1..1..0..0..1. .0..1..0..1..0..1. .0..1..1..0..0..1. .0..1..0..1..0..1
..1..0..0..1..1..0. .0..1..0..1..0..0. .1..0..0..0..1..0. .1..1..0..1..1..1
..0..1..1..0..0..1. .0..1..0..1..1..0. .0..1..1..1..1..0. .0..1..0..1..0..1
..1..0..0..1..1..0. .0..1..0..0..0..1. .0..1..0..0..0..1. .0..0..0..1..0..0
..0..1..1..0..0..1. .1..0..1..1..1..0. .0..1..0..1..1..0. .0..1..0..1..0..1
..0..0..1..0..1..1. .1..1..0..0..0..0. .0..0..1..1..0..0. .1..1..1..0..1..1
CROSSREFS
Cf. A298146.
Sequence in context: A320665 A303731 A298175 * A115761 A320047 A249221
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2018
STATUS
approved