A261551 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011.

336, 484, 754, 769, 816, 1286, 1510, 1615, 2362, 3215, 3431, 4393, 7048, 7780, 8410, 13211, 16608, 17829, 24668, 36190, 39242, 46637, 73624, 86018, 93335, 138721, 186633, 201052, 260339, 393430, 441304, 504693, 773636, 962188, 1043739, 1459993

Offset

1,1

Comments

Column 4 of A261553.

Links

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

Formula

Empirical: a(n) = 4*a(n-7) +4*a(n-10) +2*a(n-13) -3*a(n-14) -2*a(n-17) +a(n-20) -4*a(n-21) -4*a(n-23) -8*a(n-24) -a(n-26) -6*a(n-27) +3*a(n-28) +3*a(n-34) +2*a(n-35) +2*a(n-38) for n>44

Example

Some solutions for n=4
..0..0..0..0..0..0....0..0..0..0..0..0....1..0..0..1..0..0....1..1..0..0..0..0
..0..1..0..0..0..1....0..0..1..0..0..1....0..0..0..0..0..0....0..0..0..0..0..1
..0..0..1..0..0..0....0..1..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0
..0..0..0..0..0..1....0..0..0..0..0..0....0..1..0..0..1..0....0..1..0..0..0..1
..0..0..0..0..0..0....0..0..0..0..1..0....0..0..0..0..0..1....0..0..0..0..0..0
..0..0..1..0..1..1....1..0..0..1..0..1....0..0..0..0..0..1....0..0..0..0..1..1

Crossrefs

Cf. A261553.

Sequence in context: A090487 A289220 A060664 * A247530 A064259 A181256

Adjacent sequences: A261548 A261549 A261550 * A261552 A261553 A261554

Keyword

nonn

Author

R. H. Hardin, Aug 24 2015

Status

approved