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A207512 Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 1 vertically 1
18, 324, 660, 1992, 5334, 10340, 22960, 46826, 94601, 192192, 375592, 746568, 1463672, 2848131, 5567402, 10787309, 20928995, 40520266, 78275905, 151304457, 291889743, 563242937, 1086277275, 2094265839, 4038763494, 7785977121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A207514

LINKS

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

FORMULA

Empirical: a(n) = -4*a(n-1) +36*a(n-3) +84*a(n-4) -12*a(n-5) -404*a(n-6) -732*a(n-7) -7*a(n-8) +2152*a(n-9) +3737*a(n-10) +1128*a(n-11) -6329*a(n-12) -12308*a(n-13) -7232*a(n-14) +10340*a(n-15) +26567*a(n-16) +21940*a(n-17) -7013*a(n-18) -37776*a(n-19) -39525*a(n-20) -5456*a(n-21) +36222*a(n-22) +46948*a(n-23) +16831*a(n-24) -25388*a(n-25) -40656*a(n-26) -18644*a(n-27) +15479*a(n-28) +29192*a(n-29) +14445*a(n-30) -9216*a(n-31) -19082*a(n-32) -10036*a(n-33) +4571*a(n-34) +11156*a(n-35) +6651*a(n-36) -1244*a(n-37) -5277*a(n-38) -3772*a(n-39) -251*a(n-40) +1740*a(n-41) +1555*a(n-42) +332*a(n-43) -361*a(n-44) -444*a(n-45) -107*a(n-46) +56*a(n-47) +107*a(n-48) +28*a(n-49) -2*a(n-50) -16*a(n-51) -3*a(n-52) +a(n-54) for n>60

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A049660 A207697 A207593 * A207686 A207344 A207486

Adjacent sequences:  A207509 A207510 A207511 * A207513 A207514 A207515

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 18 2012

STATUS

approved

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Last modified October 18 18:47 EDT 2021. Contains 348068 sequences. (Running on oeis4.)