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

1024, 3037500, 8977824540, 26533211918040, 78416544382742160, 231753101877188629380, 684925618712729136913980, 2024236566241727245692157080, 5982450596328307878990974438640

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