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A299330
Number of nX4 0..1 arrays with every element equal to 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
1
0, 6, 36, 263, 2537, 22718, 214683, 2024559, 19169227, 181762287, 1723995924, 16356826774, 155199770911, 1472657804158, 13973960703276, 132598941011278, 1258235426682140, 11939448572555797, 113293986222690113
OFFSET
1,2
COMMENTS
Column 4 of A299334.
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +42*a(n-2) -97*a(n-3) -760*a(n-4) -293*a(n-5) +4331*a(n-6) +7298*a(n-7) -1378*a(n-8) -15896*a(n-9) -25556*a(n-10) -16583*a(n-11) +646*a(n-12) +14623*a(n-13) +22835*a(n-14) +24608*a(n-15) +8564*a(n-16) -17982*a(n-17) +3869*a(n-18) -524*a(n-19) -11907*a(n-20) -6997*a(n-21) +8341*a(n-22) +3006*a(n-23) -7404*a(n-24) +2016*a(n-25) +1712*a(n-26) -680*a(n-27) for n>28
EXAMPLE
Some solutions for n=5
..0..0..0..1. .0..0..0..0. .0..0..1..1. .0..0..1..1. .0..0..1..1
..0..0..1..1. .1..0..0..0. .0..0..0..1. .0..1..1..1. .1..0..1..1
..0..1..1..1. .1..1..1..0. .0..0..0..1. .0..0..0..1. .1..1..0..0
..1..1..0..0. .0..1..0..1. .1..0..1..0. .1..1..0..0. .0..1..0..1
..1..1..0..0. .0..0..1..1. .1..1..0..0. .1..0..0..0. .0..0..1..1
CROSSREFS
Cf. A299334.
Sequence in context: A221461 A374986 A090015 * A335811 A144892 A204210
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 07 2018
STATUS
approved