Number of nX4 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it.

A238722

Number of nX4 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it.

Terms

    a(0) =4a(1) =16a(2) =86a(3) =284a(4) =1506a(5) =4636a(6) =24298a(7) =73300a(8) =381280a(9) =1144292a(10) =5923512a(11) =17767180a(12) =91688754a(13) =275195668a(14) =1417323260a(15) =4257556764a(16) =21898760846a(17) =65830136636a(18) =338306366754

External references