A219101 Unmatched value maps: number of nX3 binary arrays indicating the locations of corresponding elements not equal to any horizontal, vertical or antidiagonal neighbor in a random 0..2 nX3 array

4, 42, 288, 1971, 13674, 95146, 660556, 4584620, 31824915, 220924781, 1533614678, 10646013585, 73902329152, 513014128876, 3561233933988, 24721320932489, 171610099765915, 1191280452221190, 8269613020988031, 57405877333497254

Offset

1,1

Comments

Column 3 of A219106

Links

R. H. Hardin, Table of n, a(n) for n = 1..60

Formula

Empirical: a(n) = 8*a(n-1) -11*a(n-2) +25*a(n-3) +7*a(n-4) -46*a(n-5) +115*a(n-6) -75*a(n-7) -10*a(n-8) +180*a(n-9) -264*a(n-10) +268*a(n-11) -132*a(n-12) +28*a(n-13) +16*a(n-14) -8*a(n-15) for n>21

Example

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

Crossrefs

Sequence in context: A157719 A280956 A301943 * A118447 A219980 A321957

Adjacent sequences: A219098 A219099 A219100 * A219102 A219103 A219104

Keyword

nonn

Author

R. H. Hardin Nov 11 2012

Status

approved