A260837 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

364, 496, 1224, 2235, 2590, 6232, 13170, 17731, 34192, 77780, 123488, 206695, 457440, 825256, 1336836, 2725379, 5298108, 8851516, 16674798, 33192375, 58277638, 104857040, 206110260, 377809047, 671142648, 1283474236, 2413960656

Offset: 1

Author

R. H. Hardin, Aug 01 2015

Keywords

• nonn

Comments

Column 4 of A260841

Examples

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

Links

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

Crossrefs

Cf. A260841

Formula

Empirical: a(n) = a(n-1) +a(n-2) +6*a(n-3) -a(n-4) -12*a(n-5) -15*a(n-6) +2*a(n-7) +18*a(n-8) +28*a(n-9) -3*a(n-10) -28*a(n-11) -a(n-12) +9*a(n-13) +12*a(n-14) +10*a(n-15) -19*a(n-16) -36*a(n-17) +4*a(n-18) +10*a(n-19) -4*a(n-20) +23*a(n-21) +a(n-22) -20*a(n-23) +9*a(n-24) +10*a(n-25) -4*a(n-26) +6*a(n-27) +8*a(n-28) -14*a(n-29) +2*a(n-31) -5*a(n-32) +3*a(n-33) for n>34