A206007 Number of (n+1)X6 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero

2136, 12304, 33572, 211824, 566288, 3844878, 10015204, 72882376, 184281412, 1429092252, 3503416892, 28746962046, 68400079832, 589318256362, 1364400638604, 12250849422816, 27688353774584, 257303980884418

Offset

1,1

Comments

Column 5 of A206010

Links

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

Formula

Empirical: a(n) = 164*a(n-2) -12476*a(n-4) +585148*a(n-6) -18969092*a(n-8) +451611112*a(n-10) -8190280543*a(n-12) +115840500148*a(n-14) -1297796212524*a(n-16) +11636077109568*a(n-18) -84046878051360*a(n-20) +490938478405232*a(n-22) -2323179214444607*a(n-24) +8905940073527580*a(n-26) -27608686922699724*a(n-28) +68932456482316032*a(n-30) -137542051160082324*a(n-32) +216042155055337272*a(n-34) -258785650934882237*a(n-36) +217934459268105772*a(n-38) -91407840400253580*a(n-40) -59251485033120380*a(n-42) +153874632100815864*a(n-44) -159455241712666896*a(n-46) +106418956478645532*a(n-48) -47120836797437152*a(n-50) +11341651410829760*a(n-52) +1121752277991232*a(n-54) -2336969544836224*a(n-56) +1100999738775552*a(n-58) -308227751799552*a(n-60) +55643719481856*a(n-62) -6125302259712*a(n-64) +318823464960*a(n-66) for n>70

Example

Some solutions for n=4
..1..1..2..1..1..1....0..1..1..0..2..2....0..2..2..2..0..2....2..1..0..2..1..2
..1..2..2..2..1..0....1..1..2..2..2..0....2..2..0..2..2..2....2..2..2..2..2..2
..1..1..2..1..1..1....1..2..2..1..2..2....1..2..2..2..1..2....0..1..2..1..2..1
..2..1..1..1..2..1....1..1..2..2..2..1....2..2..0..2..2..2....1..1..1..1..1..1
..2..2..0..1..1..1....0..1..1..2..0..1....0..2..2..2..1..2....2..0..1..2..0..1

Crossrefs

Sequence in context: A157768 A067199 A064249 * A233229 A233146 A233238

Adjacent sequences: A206004 A206005 A206006 * A206008 A206009 A206010

Keyword

nonn

Author

R. H. Hardin Feb 02 2012

Status

approved