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A185564 1/4 the number of nX6 0..3 arrays with no element equal both to the element above and to the element to its left 1
1024, 3037500, 8977824540, 26533211918040, 78416544382742160, 231753101877188629380, 684925618712729136913980, 2024236566241727245692157080, 5982450596328307878990974438640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A185567

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=3176*a(n-1)-673550*a(n-2)+65136330*a(n-3)-3727689126*a(n-4)+139845804688*a(n-5)-3603160371660*a(n-6)+64834978133874*a(n-7)-810096692648238*a(n-8)+6824155175157060*a(n-9)-36345608355460626*a(n-10)+107463532615201134*a(n-11)-134880780658290660*a(n-12)+77768725332170250*a(n-13)-12154766339477250*a(n-14)-11593534218480000*a(n-15)+6932136333037500*a(n-16)-1023032228765625*a(n-17)

EXAMPLE

Some solutions for 3X6 with a(1,1)=0

..0..0..0..2..2..2....0..0..0..2..0..0....0..0..0..0..0..3....0..0..0..2..2..3

..0..2..2..0..1..0....0..2..0..2..2..1....0..2..2..2..0..2....0..2..0..2..0..3

..0..0..2..2..2..2....0..0..2..3..0..0....0..0..0..2..3..2....0..0..2..3..1..3

CROSSREFS

Sequence in context: A140300 A223355 A222142 * A016798 A330485 A016834

Adjacent sequences:  A185561 A185562 A185563 * A185565 A185566 A185567

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 31 2011

STATUS

approved

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Last modified August 19 06:10 EDT 2022. Contains 356216 sequences. (Running on oeis4.)