Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 3 king-move adjacent elements, with upper left element zero.

A303722

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 3 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =21a(2) =23a(3) =46a(4) =77a(5) =151a(6) =294a(7) =549a(8) =1051a(9) =2032a(10) =3877a(11) =7421a(12) =14262a(13) =27333a(14) =52371a(15) =100472a(16) =192665a(17) =369353a(18) =708294a(19) =1358233a(20) =2604287a(21) =4993776a(22) =9575821a(23) =18361581a(24) =35208486a(25) =67513133a(26) =129457227a(27) =248235688a(28) =475996017a(29) =912729185

External references