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A268970
Number of nX7 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
1
768, 40176, 1770048, 72081792, 2799406656, 105294777120, 3870355944960, 139818682627488, 4983158127443904, 175684152567641184, 6139001133769997952, 212930705454132284064, 7339160588604264574272, 251599271436625798745568
OFFSET
1,1
COMMENTS
Column 7 of A268971.
LINKS
FORMULA
Empirical: a(n) = 84*a(n-1) -2466*a(n-2) +31428*a(n-3) -206469*a(n-4) +750384*a(n-5) -1513404*a(n-6) +1574640*a(n-7) -656100*a(n-8)
EXAMPLE
Some solutions for n=2
..2..2..1..0..1..2..2. .1..2..0..1..0..0..0. .0..1..2..1..0..1..0
..1..0..1..2..1..2..0. .2..1..0..0..0..0..0. .2..1..2..1..2..0..1
CROSSREFS
Cf. A268971.
Sequence in context: A282287 A268627 A170783 * A339763 A204625 A290271
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2016
STATUS
approved