Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

A304350

Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =9a(2) =13a(3) =27a(4) =60a(5) =123a(6) =280a(7) =729a(8) =2015a(9) =5844a(10) =17796a(11) =55746a(12) =176718a(13) =565998a(14) =1824691a(15) =5895378a(16) =19079961a(17) =61831121a(18) =200450950a(19) =650016786a(20) =2108377349a(21) =6839182152a(22) =22185876476a(23) =71972913726a(24) =233489826816a(25) =757476164734

External references