A268909 Number of 6Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

0, 33792, 715392, 14644152, 282550680, 5344944120, 99308573208, 1821165633864, 33033242938536, 593761996675728, 10591066349377632, 187684309946743128, 3307315733915348808, 57997191529735867080, 1012715407159459735536

Offset

1,2

Comments

Row 6 of A268904.

Links

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

Formula

Empirical: a(n) = 60*a(n-1) -1466*a(n-2) +19056*a(n-3) -143515*a(n-4) +608478*a(n-5) -957350*a(n-6) -3924114*a(n-7) +27201539*a(n-8) -68079378*a(n-9) +46537423*a(n-10) +212613240*a(n-11) -785654632*a(n-12) +1389943104*a(n-13) -1544105168*a(n-14) +1125401088*a(n-15) -524553472*a(n-16) +142135296*a(n-17) -17040384*a(n-18) for n>26

Example

Some solutions for n=2
..1..0. .0..0. .2..0. .0..1. .0..1. .1..1. .1..2. .0..1. .0..2. .1..0
..1..0. .1..2. .1..2. .0..2. .0..0. .2..2. .2..1. .0..2. .2..2. .1..0
..1..1. .1..0. .1..2. .2..1. .1..0. .1..2. .2..1. .2..2. .1..2. .0..1
..0..0. .1..0. .1..0. .2..1. .1..2. .2..2. .2..1. .2..2. .2..1. .2..1
..1..2. .1..2. .1..2. .2..2. .0..1. .2..1. .2..2. .2..1. .0..1. .1..0
..1..2. .1..1. .1..2. .2..1. .0..1. .0..0. .0..0. .2..2. .2..2. .0..0

Crossrefs

Cf. A268904.

Sequence in context: A235735 A235516 A204949 * A243467 A205166 A238514

Adjacent sequences: A268906 A268907 A268908 * A268910 A268911 A268912

Keyword

nonn

Author

R. H. Hardin, Feb 15 2016

Status

approved