Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..2 order.

A223028

Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..2 order.

Terms

    a(0) =0a(1) =6a(2) =16a(3) =58a(4) =136a(5) =352a(6) =768a(7) =1752a(8) =3680a(9) =7904a(10) =16256a(11) =33824a(12) =68736a(13) =140544a(14) =283648a(15) =574336a(16) =1154560a(17) =2324992a(18) =4663296a(19) =9361920a(20) =18753536a(21) =37584896a(22) =75235328a(23) =150640640a(24) =301424640a(25) =603217920a(26) =1206747136a(27) =2414288896a(28) =4829249536

External references