Number of nX4 0..2 arrays with exactly floor(nX4/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..2 order.

A223030

Number of nX4 0..2 arrays with exactly floor(nX4/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..2 order.

Terms

    a(0) =6a(1) =58a(2) =472a(3) =1341a(4) =6472a(5) =15374a(6) =60497a(7) =142610a(8) =499278a(9) =1229381a(10) =3993742a(11) =10383806a(12) =32203849a(13) =87752662a(14) =265166874a(15) =747479421a(16) =2230395230a(17) =6428099474a(18) =19088788221a(19) =55776955238a(20) =165502617034a(21) =487703210601

External references