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A269294
Number of 6Xn 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.
1
4096, 3306744, 1085203980, 309846524148, 81907569617580, 20680187784811380, 5062027330721456172, 1211690913720475660164, 285185178252679536489420, 66240633180683878759737972, 15223317892237120439440690380
OFFSET
1,1
COMMENTS
Row 6 of A269289.
FORMULA
Empirical recurrence of order 40 (see link above)
EXAMPLE
Some solutions for n=2
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..2..3. .0..1. .2..3. .0..0. .2..0. .0..1. .2..2. .0..1. .1..0. .2..0
..1..3. .2..0. .3..3. .1..1. .0..2. .1..0. .2..0. .3..3. .0..0. .0..1
..0..1. .1..0. .3..1. .1..1. .2..3. .2..3. .1..2. .1..0. .1..0. .0..2
..3..1. .0..0. .1..0. .3..3. .1..3. .3..2. .3..2. .1..0. .0..0. .0..2
..0..1. .2..3. .2..0. .0..1. .3..1. .0..1. .0..1. .2..2. .1..2. .2..3
CROSSREFS
Cf. A269289.
Sequence in context: A224208 A017034 A017118 * A221093 A017214 A017322
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2016
STATUS
approved