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A260066 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111 1
557, 1214, 3825, 7725, 12664, 34917, 89948, 166473, 353678, 964837, 2132058, 4168981, 10127802, 25093839, 52249344, 112937943, 279024186, 637020921, 1344587610, 3105334621, 7406927290, 16274194729, 35781699436, 84141524719 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A260070

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) +8*a(n-3) +21*a(n-4) -14*a(n-5) -60*a(n-6) -76*a(n-7) -98*a(n-8) +139*a(n-9) +324*a(n-10) +176*a(n-11) +138*a(n-12) -351*a(n-13) -596*a(n-14) -154*a(n-15) +90*a(n-16) +484*a(n-17) +424*a(n-18) +72*a(n-19) -160*a(n-20) -288*a(n-21) for n>25

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260070

Sequence in context: A319061 A339533 A344828 * A105979 A183779 A342825

Adjacent sequences:  A260063 A260064 A260065 * A260067 A260068 A260069

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 14 2015

STATUS

approved

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Last modified October 19 13:40 EDT 2021. Contains 348090 sequences. (Running on oeis4.)