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A207513 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 1 vertically 1
25, 625, 1292, 4168, 11465, 22960, 50322, 105370, 214519, 434467, 859485, 1700263, 3341334, 6498994, 12653384, 24514485, 47342410, 91409818, 176001232, 338633421, 651272262, 1250858298, 2403095620, 4614434368, 8859453967, 17015312734 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A207514

LINKS

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

FORMULA

Empirical: a(n) = -4*a(n-1) +2*a(n-2) +44*a(n-3) +83*a(n-4) -88*a(n-5) -571*a(n-6) -668*a(n-7) +885*a(n-8) +3568*a(n-9) +3263*a(n-10) -3896*a(n-11) -13406*a(n-12) -11680*a(n-13) +9170*a(n-14) +33932*a(n-15) +30965*a(n-16) -12176*a(n-17) -61050*a(n-18) -59008*a(n-19) +8300*a(n-20) +81696*a(n-21) +81692*a(n-22) -1856*a(n-23) -88125*a(n-24) -86964*a(n-25) +1429*a(n-26) +84536*a(n-27) +77400*a(n-28) -5856*a(n-29) -74000*a(n-30) -60856*a(n-31) +8163*a(n-32) +56232*a(n-33) +41701*a(n-34) -7180*a(n-35) -36018*a(n-36) -24376*a(n-37) +5074*a(n-38) +19908*a(n-39) +12383*a(n-40) -3116*a(n-41) -9871*a(n-42) -5676*a(n-43) +1555*a(n-44) +4404*a(n-45) +2421*a(n-46) -464*a(n-47) -1595*a(n-48) -860*a(n-49) +38*a(n-50) +428*a(n-51) +215*a(n-52) +4*a(n-53) -102*a(n-54) -44*a(n-55) -3*a(n-56) +16*a(n-57) +4*a(n-58) -a(n-60) for n>67

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207926 A207698 A207594 * A207687 A207345 A207487

Adjacent sequences:  A207510 A207511 A207512 * A207514 A207515 A207516

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 18 2012

STATUS

approved

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Last modified October 27 02:00 EDT 2021. Contains 348270 sequences. (Running on oeis4.)