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A269056 Number of 5Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once. 1
243, 2430, 17346, 183072, 1643376, 15547380, 140497512, 1273499256, 11354964888, 100764874440, 886829123676, 7765850889120, 67643548943508, 586749197487720, 5069733374448192, 43657996370224608, 374818434125094900 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A269052.

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) +26*a(n-2) -566*a(n-3) -123*a(n-4) +8804*a(n-5) -4121*a(n-6) -59620*a(n-7) +55115*a(n-8) +183692*a(n-9) -256127*a(n-10) -211910*a(n-11) +498819*a(n-12) -48036*a(n-13) -371692*a(n-14) +214008*a(n-15) +43848*a(n-16) -64656*a(n-17) +8640*a(n-18) +5184*a(n-19) -1296*a(n-20) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A269052.

Sequence in context: A217968 A233158 A100627 * A209507 A226777 A016757

Adjacent sequences:  A269053 A269054 A269055 * A269057 A269058 A269059

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved

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Last modified June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)