A273965 Number of nX2 0..3 arrays with no three equal values forming an isosceles triangle, and new values introduced in 0..3 order.

2, 10, 105, 1264, 13045, 136063, 1273961, 11936399, 95697853, 800561388, 5824237329, 42821430074, 277065391875

Offset

1,1

Comments

Column 2 of A273968.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..0..1. .0..1. .0..0. .0..1. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1
..2..3. .2..1. .1..2. .2..1. .1..2. .1..2. .1..1. .2..2. .1..1. .0..2
..2..3. .0..0. .3..0. .3..3. .3..2. .1..2. .2..0. .1..0. .0..2. .0..2
..3..1. .2..3. .3..2. .1..1. .2..0. .0..3. .2..1. .1..0. .1..3. .1..2

Crossrefs

Cf. A273968.

Sequence in context: A208730 A000595 A087234 * A273961 A365507 A049538

Adjacent sequences: A273962 A273963 A273964 * A273966 A273967 A273968

Keyword

nonn

Author

R. H. Hardin, Jun 05 2016

Status

approved