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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268971.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences:  A268967 A268968 A268969 * A268971 A268972 A268973

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2016

STATUS

approved

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Last modified August 7 21:39 EDT 2022. Contains 355995 sequences. (Running on oeis4.)