A218066 Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..1 3Xn array.

8, 16, 74, 260, 1046, 3974, 15578, 60242, 234468, 910060, 3536762, 13737348, 53371468, 207332364, 805465810, 3129084596, 12156035112, 47224200410, 183458638422, 712707497212, 2768755861210, 10756176540402, 41786039888224

Offset

1,1

Comments

Row 3 of A218064

Links

R. H. Hardin, Table of n, a(n) for n = 1..170

Formula

Empirical: a(n) = 2*a(n-1) +11*a(n-2) -7*a(n-3) -34*a(n-4) +11*a(n-5) +49*a(n-6) -14*a(n-7) -36*a(n-8) +7*a(n-9) +a(n-10) +8*a(n-11) +2*a(n-12) -13*a(n-13) +2*a(n-14) +4*a(n-15) for n>18

Example

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

Crossrefs

Sequence in context: A218899 A282785 A278747 * A157164 A131539 A331419

Adjacent sequences: A218063 A218064 A218065 * A218067 A218068 A218069

Keyword

nonn

Author

R. H. Hardin, Oct 19 2012

Status

approved