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A261264 Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101. 1
1123, 1436, 6795, 26072, 85617, 274100, 1062118, 3488342, 12721239, 41920830, 155836702, 510815882, 1888254136, 6209495774, 22984035493, 75470825466, 279286307313, 917683052186, 3395646295243, 11155308717668, 41278408039419 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A261265.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-2) +79*a(n-4) +a(n-5) +247*a(n-6) -3*a(n-7) +32*a(n-8) -74*a(n-9) -753*a(n-10) -9*a(n-11) -1402*a(n-12) +1289*a(n-13) +7459*a(n-14) -973*a(n-15) -7467*a(n-16) -10676*a(n-17) -6513*a(n-18) +19379*a(n-19) +24282*a(n-20) +9547*a(n-21) -22677*a(n-22) -62038*a(n-23) +189*a(n-24) +70432*a(n-25) +15606*a(n-26) -14003*a(n-27) -6976*a(n-28) -40743*a(n-29) -2370*a(n-30) +24865*a(n-31) -801*a(n-32) +14267*a(n-33) +835*a(n-34) -6129*a(n-35) +1383*a(n-36) -13883*a(n-37) -619*a(n-38) +3247*a(n-39) -246*a(n-40) +6705*a(n-41) +160*a(n-42) -1834*a(n-43) +22*a(n-44) -1348*a(n-45) -15*a(n-46) +441*a(n-47) -10*a(n-48) +153*a(n-49) -a(n-50) -34*a(n-51) -20*a(n-53) -a(n-55) for n>62

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A261265.

Sequence in context: A035859 A105310 A200072 * A125840 A069984 A104285

Adjacent sequences:  A261261 A261262 A261263 * A261265 A261266 A261267

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 13 2015

STATUS

approved

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Last modified September 23 04:54 EDT 2020. Contains 337295 sequences. (Running on oeis4.)