Number of nX4 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

A303686

Number of nX4 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =18a(2) =20a(3) =138a(4) =343a(5) =1744a(6) =5563a(7) =23963a(8) =85439a(9) =343499a(10) =1279385a(11) =5002512a(12) =18966028a(13) =73327791a(14) =280007343a(15) =1077678731a(16) =4127070788a(17) =15855095931a(18) =60788926535a(19) =233363355500a(20) =895138948721

External references