login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

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

%I #4 Jun 05 2016 14:36:38

%S 2,10,105,1264,13045,136063,1273961,11936399,95697853,800561388,

%T 5824237329,42821430074,277065391875

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

%C Column 2 of A273968.

%e Some solutions for n=4

%e ..0..1. .0..1. .0..0. .0..1. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1

%e ..2..3. .2..1. .1..2. .2..1. .1..2. .1..2. .1..1. .2..2. .1..1. .0..2

%e ..2..3. .0..0. .3..0. .3..3. .3..2. .1..2. .2..0. .1..0. .0..2. .0..2

%e ..3..1. .2..3. .3..2. .1..1. .2..0. .0..3. .2..1. .1..0. .1..3. .1..2

%Y Cf. A273968.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jun 05 2016