A260763 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011

350, 481, 1234, 2449, 3328, 7645, 16095, 25501, 51049, 109299, 189890, 355743, 749522, 1385493, 2541076, 5180564, 9948565, 18318480, 36192443, 70704397, 131994545, 255359264, 500237231, 947181697, 1813491686, 3537676433

Offset

1,1

Comments

Column 4 of A260767

Links

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

Formula

Empirical: a(n) = 10*a(n-3) +12*a(n-4) +2*a(n-5) -36*a(n-6) -90*a(n-7) -79*a(n-8) +45*a(n-9) +240*a(n-10) +403*a(n-11) +259*a(n-12) -213*a(n-13) -750*a(n-14) -1071*a(n-15) -660*a(n-16) +323*a(n-17) +1344*a(n-18) +1874*a(n-19) +1401*a(n-20) +10*a(n-21) -1324*a(n-22) -2235*a(n-23) -2041*a(n-24) -779*a(n-25) +478*a(n-26) +1614*a(n-27) +1909*a(n-28) +1173*a(n-29) +407*a(n-30) -498*a(n-31) -1085*a(n-32) -747*a(n-33) -601*a(n-34) -44*a(n-35) +248*a(n-36) +253*a(n-37) +251*a(n-38) +56*a(n-39) +76*a(n-40) -88*a(n-41) +19*a(n-42) -20*a(n-43) -51*a(n-44) +28*a(n-45) -37*a(n-46) +12*a(n-47) +6*a(n-48) -2*a(n-49) +6*a(n-50) -4*a(n-51) +a(n-52) for n>58

Example

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

Crossrefs

Cf. A260767

Sequence in context: A138944 A043619 A249430 * A109761 A109762 A074055

Adjacent sequences: A260760 A260761 A260762 * A260764 A260765 A260766

Keyword

nonn

Author

R. H. Hardin, Jul 30 2015

Status

approved