A230649 Number of nX5 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j)

0, 15, 27, 531, 1635, 28161, 90393, 1539207, 4956927, 84335553, 271665969, 4621740687, 14888070495, 253283346081, 815905965057, 13880597644287, 44713811014239, 760693546670625, 2450435395047009, 41688023124390687

Offset

1,2

Comments

Column 5 of A230652

Links

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

Formula

Empirical: a(n) = 59*a(n-2) -230*a(n-4) -2*a(n-6) +32*a(n-8) for n>11

Example

Some solutions for n=5
..0..x..0..x..0....2..x..2..x..1....1..x..1..x..0....2..x..2..x..0
..x..2..x..2..x....x..0..x..1..x....x..1..x..2..x....x..0..x..2..x
..0..x..1..x..0....2..x..1..x..1....0..x..1..x..0....2..x..2..x..1
..x..0..x..1..x....x..1..x..2..x....x..2..x..0..x....x..0..x..1..x
..2..x..1..x..1....1..x..1..x..0....0..x..0..x..2....2..x..1..x..1

Crossrefs

Sequence in context: A249874 A116070 A186074 * A229195 A073766 A223449

Adjacent sequences: A230646 A230647 A230648 * A230650 A230651 A230652

Keyword

nonn

Author

R. H. Hardin, Oct 27 2013

Status

approved