A207721 - OEIS

A207721

Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically

22, 484, 5302, 66946, 820820, 10150118, 125165018, 1545006848, 19064074106, 235267721766, 2903258039792, 35827609743354, 442126584439650, 5456029684316684, 67329644638468630, 830875800786510138

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 6 of A207717

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +63*a(n-2) -85*a(n-3) -424*a(n-4) +387*a(n-5) +724*a(n-6) -695*a(n-7) -148*a(n-8) +185*a(n-9) +13*a(n-10) -14*a(n-11) -a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A207446 A223642 A207744 * A223737 A223635 A223720

Adjacent sequences: A207718 A207719 A207720 * A207722 A207723 A207724

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 2012

STATUS

approved