Number of (n+1)X3 0..3 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

A185800

Number of (n+1)X3 0..3 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

Terms

    a(0) =704a(1) =13440a(2) =260544a(3) =5177344a(4) =104024384a(5) =2091689856a(6) =42093682560a(7) =847003638592

External references