A185462 Number of (n+1)X5 binary arrays with no 2X2 subblock determinant equal to any horizontal or vertical neighbor 2X2 subblock determinant

218, 672, 2766, 13977, 49670, 231636, 798330, 3709535, 12773958, 59358300, 204384986, 949713803, 3270113366, 15195208008, 52321104606, 243120127107, 837126587718, 3889870442680, 13393847713706, 62237101136015

Offset

1,1

Comments

Column 4 of A185467

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=14*a(n-2)+27*a(n-4)+75*a(n-6)+77*a(n-8)+32*a(n-10)+a(n-12)-a(n-14) for n>20

Example

Some solutions for 3X5
..1..0..1..0..0....1..1..1..1..0....0..1..0..1..1....1..1..1..1..1
..1..1..0..1..1....1..0..1..0..1....0..1..1..0..1....0..1..0..1..0
..0..0..1..0..1....0..1..1..1..1....1..0..0..1..0....1..1..1..1..0

Crossrefs

Sequence in context: A260496 A038595 A045239 * A253740 A253733 A241102

Adjacent sequences: A185459 A185460 A185461 * A185463 A185464 A185465

Keyword

nonn

Author

R. H. Hardin Jan 28 2011

Status

approved