Number of nX2 0..1 arrays with every element equal to 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

A298448

Number of nX2 0..1 arrays with every element equal to 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =4a(2) =4a(3) =16a(4) =48a(5) =88a(6) =240a(7) =704a(8) =1600a(9) =4032a(10) =11072a(11) =27392a(12) =68608a(13) =180736a(14) =459776a(15) =1160704a(16) =2999296a(17) =7682048a(18) =19525632a(19) =50081792a(20) =128339968a(21) =327434240a(22) =837861376a(23) =2145583104a(24) =5483266048a(25) =14023229440a(26) =35888758784a(27) =91776090112a(28) =234707222528

External references