A269049 - OEIS

A269049

Number of nX5 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

144, 1068, 13140, 149358, 1643376, 17696520, 187575858, 1964080920, 20365312416, 209472681102, 2140087086852, 21738862087680, 219728193571542, 2211332610944712, 22170082238167692, 221519854346189046

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OFFSET

1,1

COMMENTS

Column 5 of A269052.

LINKS

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

FORMULA

Empirical: a(n) = 28*a(n-1) -286*a(n-2) +1290*a(n-3) -2373*a(n-4) +304*a(n-5) +3551*a(n-6) -2846*a(n-7) -546*a(n-8) +1308*a(n-9) -505*a(n-10) +76*a(n-11) -4*a(n-12) for n>13

EXAMPLE

Some solutions for n=4

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

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

..0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0. .1..0..1..0..1

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

CROSSREFS

Cf. A269052.

Sequence in context: A165080 A165082 A165088 * A165086 A337794 A235568

Adjacent sequences: A269046 A269047 A269048 * A269050 A269051 A269052

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved