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A268806 Number of nX5 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once. 1
144, 772, 4158, 28452, 195384, 1316226, 8734264, 57302798, 372342650, 2400532536, 15373692036, 97900054556, 620374078660, 3914367133320, 24605301916568, 154148669247610, 962830699411796, 5997782979007294, 37271323919688010 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A268809.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +41*a(n-2) +54*a(n-3) -509*a(n-4) -2182*a(n-5) -2830*a(n-6) +1766*a(n-7) +7914*a(n-8) +2584*a(n-9) -10583*a(n-10) -6092*a(n-11) +11506*a(n-12) +5348*a(n-13) -11688*a(n-14) -620*a(n-15) +9251*a(n-16) -4462*a(n-17) -3137*a(n-18) +4774*a(n-19) -2365*a(n-20) +338*a(n-21) +198*a(n-22) -106*a(n-23) +12*a(n-24) +4*a(n-25) -a(n-26) for n>29

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268809.

Sequence in context: A033696 A233653 A233646 * A112067 A210724 A237738

Adjacent sequences:  A268803 A268804 A268805 * A268807 A268808 A268809

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2016

STATUS

approved

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Last modified August 19 20:22 EDT 2022. Contains 356229 sequences. (Running on oeis4.)