A268908 - OEIS

A268908

Number of 5 X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

0, 6912, 98496, 1347192, 17194680, 214142760, 2611960344, 31382176824, 372469407912, 4376985056856, 51011490408120, 590386685589432, 6792451934064264, 77748739088317848, 885979967930009496

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OFFSET

1,2

COMMENTS

Row 5 of A268904.

LINKS

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

FORMULA

Empirical: a(n) = 32*a(n-1) -384*a(n-2) +2200*a(n-3) -6494*a(n-4) +9016*a(n-5) -816*a(n-6) -14888*a(n-7) +18879*a(n-8) -5464*a(n-9) -7472*a(n-10) +8336*a(n-11) -3648*a(n-12) +768*a(n-13) -64*a(n-14) for n>18.

EXAMPLE

Some solutions for n=3

..2..2..1. .0..2..2. .2..1..2. .1..0..1. .2..1..2. .0..0..0. .2..1..0

..2..0..1. .1..2..1. .2..1..0. .0..2..2. .0..2..1. .1..0..0. .2..1..0

..1..2..1. .1..0..1. .0..0..1. .2..2..2. .1..2..2. .1..0..0. .2..1..0

..1..0..0. .1..2..2. .1..2..2. .1..2..2. .1..2..2. .0..1..0. .2..1..2

..0..0..0. .1..2..2. .1..1..0. .1..2..2. .2..2..1. .0..1..1. .0..0..0

CROSSREFS

Cf. A268904.

Sequence in context: A233223 A106768 A156419 * A192077 A272913 A230468

Adjacent sequences: A268905 A268906 A268907 * A268909 A268910 A268911

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 2016

STATUS

approved