A218067 Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..1 4Xn array.

16, 42, 308, 1664, 10246, 60804, 368220, 2217012, 13380802, 80716652, 487004728, 2938281242, 17727888682, 106960361186, 645338542928, 3893618011484, 23491925716860, 141737303076720, 855164357481732, 5159588643396442

Offset

1,1

Comments

Row 4 of A218064

Links

R. H. Hardin, Table of n, a(n) for n = 1..70

Example

Some solutions for n=3
..1..0..0....1..0..0....1..0..1....0..0..0....0..0..1....1..0..1....0..0..1
..0..0..0....1..0..0....0..0..0....1..0..0....0..0..1....0..0..0....0..0..0
..0..1..0....0..0..1....1..0..0....1..0..1....1..0..1....1..0..0....0..0..0
..0..0..0....1..1..1....0..0..1....1..1..1....0..0..1....1..0..1....0..0..1

Crossrefs

Sequence in context: A318340 A318072 A304954 * A187729 A088800 A316636

Adjacent sequences: A218064 A218065 A218066 * A218068 A218069 A218070

Keyword

nonn

Author

R. H. Hardin, Oct 19 2012

Status

approved