A268797 Number of nX7 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.

576, 4360, 41248, 561116, 7801688, 104971262, 1384570516, 17967375416, 230262982692, 2921020155826, 36745483472428, 459003330021886, 5699362152372404, 70403795917829390, 865796392149477244

Offset

1,1

Comments

Column 7 of A268798.

Links

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

R. H. Hardin, Empirical recurrence of order 68

Formula

Empirical recurrence of order 68 (see link above)

Example

Some solutions for n=3
..2..2..1..2..2..2..2. .1..2..2..2..2..1..2. .2..2..2..1..1..2..2
..1..2..2..2..1..2..1. .2..1..2..2..2..2..2. .1..2..2..2..2..2..2
..2..1..2..1..2..2..2. .1..2..2..2..1..2..2. .2..1..2..2..2..1..2

Crossrefs

Cf. A268798.

Sequence in context: A281242 A067225 A325475 * A036514 A269034 A188787

Adjacent sequences: A268794 A268795 A268796 * A268798 A268799 A268800

Keyword

nonn

Author

R. H. Hardin, Feb 13 2016

Status

approved