Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 7 or 8 king-move adjacent elements, with upper left element zero.

A305581

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 7 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =3a(2) =6a(3) =8a(4) =19a(5) =33a(6) =60a(7) =112a(8) =205a(9) =377a(10) =694a(11) =1276a(12) =2347a(13) =4317a(14) =7940a(15) =14604a(16) =26861a(17) =49405a(18) =90870a(19) =167136a(20) =307411a(21) =565417a(22) =1039964a(23) =1912792a(24) =3518173a(25) =6470929a(26) =11901894a(27) =21890996a(28) =40263819a(29) =74056709

External references