A218899 Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random 0..1 3Xn array

8, 16, 72, 212, 786, 2594, 9110, 31062, 107510, 369596, 1274760, 4390640, 15132044, 52139518, 179669784, 619118588, 2133406676, 7351495186, 25332356634, 87292564824, 300799972600, 1036523262982, 3571740490936, 12307815695422

Offset

1,1

Comments

Row 3 of A218897

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +7*a(n-2) -4*a(n-3) -6*a(n-4) -10*a(n-5) -20*a(n-6) +15*a(n-7) -a(n-8) +22*a(n-9) +14*a(n-10) -5*a(n-11) -6*a(n-13) -2*a(n-14)

Example

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

Crossrefs

Sequence in context: A339355 A132794 A082982 * A282785 A278747 A218066

Adjacent sequences: A218896 A218897 A218898 * A218900 A218901 A218902

Keyword

nonn

Author

R. H. Hardin Nov 08 2012

Status

approved