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A205995 Number of (n+1)X6 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 1
4250, 81278, 1588523, 31326018, 619044912, 12247835464, 242338696294, 4795751505632, 94904033637773, 1878103568517772, 37166723083236097, 735509612732794796, 14555376968228099943, 288043172829609796654 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A205998

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) +319*a(n-2) -5980*a(n-3) -20150*a(n-4) +615234*a(n-5) -182520*a(n-6) -28731599*a(n-7) +47041785*a(n-8) +744536061*a(n-9) -1630681652*a(n-10) -12183025596*a(n-11) +29871215200*a(n-12) +133155430970*a(n-13) -348889953388*a(n-14) -1001683286778*a(n-15) +2752012598877*a(n-16) +5304296275615*a(n-17) -14433680359368*a(n-18) -19738699291763*a(n-19) +43917649990038*a(n-20) +48756149702561*a(n-21) -35076087028225*a(n-22) -93846777057204*a(n-23) -301941579764339*a(n-24) +254750586482907*a(n-25) +1609297177061511*a(n-26) -408973241927045*a(n-27) -4085245862886658*a(n-28) -225377376963909*a(n-29) +7692724899955892*a(n-30) +2417359771910174*a(n-31) -12501312717776494*a(n-32) -4526811053245240*a(n-33) +19536803077654136*a(n-34) -1235506416610526*a(n-35) -21581549817453880*a(n-36) +14949571857721494*a(n-37) +7952087494794921*a(n-38) -17175893386231872*a(n-39) +7539360165769466*a(n-40) +3192267034480634*a(n-41) -5885235960913766*a(n-42) +5070715658077399*a(n-43) -2181019911716903*a(n-44) -2520805821240826*a(n-45) +3319004208022721*a(n-46) -757242774691455*a(n-47) -659084617913153*a(n-48) +759560212624117*a(n-49) -328598101358034*a(n-50) -152473570653765*a(n-51) +220270075925241*a(n-52) +3496225954791*a(n-53) -52573374601893*a(n-54) +415344736805*a(n-55) -5123698294877*a(n-56) -1007405200366*a(n-57) +4139352720768*a(n-58) +1242104387232*a(n-59) -1611246065496*a(n-60) -73511301748*a(n-61) +154477664596*a(n-62) +95719630976*a(n-63) -24561206400*a(n-64) +3429116512*a(n-65) -374361792*a(n-66) -295295680*a(n-67) -82463744*a(n-68) +60811776*a(n-69) -6600960*a(n-70) +138240*a(n-71) for n>72

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A184684 A204872 A204638 * A237805 A031985 A138399

Adjacent sequences:  A205992 A205993 A205994 * A205996 A205997 A205998

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 02 2012

STATUS

approved

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Last modified May 18 04:58 EDT 2021. Contains 343994 sequences. (Running on oeis4.)