A260066 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111

557, 1214, 3825, 7725, 12664, 34917, 89948, 166473, 353678, 964837, 2132058, 4168981, 10127802, 25093839, 52249344, 112937943, 279024186, 637020921, 1344587610, 3105334621, 7406927290, 16274194729, 35781699436, 84141524719

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