A260540 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001

337, 566, 1411, 2775, 4398, 10949, 22212, 38389, 86646, 186223, 333028, 690553, 1521828, 2869799, 5631896, 12249267, 24273164, 46855557, 98826636, 201859033, 392337270, 804788515, 1662271148, 3279380771, 6610407134, 13637789673

Offset

1,1

Comments

Column 4 of A260544

Links

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

Formula

Empirical: a(n) = a(n-2) +7*a(n-3) +8*a(n-4) -6*a(n-5) -19*a(n-6) -23*a(n-7) -13*a(n-8) +32*a(n-9) +51*a(n-10) -4*a(n-11) +13*a(n-12) -6*a(n-13) -50*a(n-14) -28*a(n-15) -34*a(n-16) -20*a(n-17) +a(n-18) +8*a(n-19) +23*a(n-20) -3*a(n-21) +12*a(n-22) +10*a(n-23) -12*a(n-24) +7*a(n-25) -2*a(n-27) for n>31

Example

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

Crossrefs

Cf. A260544

Sequence in context: A273529 A153164 A020358 * A051962 A339480 A214492

Adjacent sequences: A260537 A260538 A260539 * A260541 A260542 A260543

Keyword

nonn

Author

R. H. Hardin, Jul 28 2015

Status

approved