Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero.

A305225

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =21a(2) =24a(3) =54a(4) =108a(5) =236a(6) =509a(7) =1091a(8) =2363a(9) =5109a(10) =11034a(11) =23867a(12) =51606a(13) =111571a(14) =241263a(15) =521680a(16) =1128006a(17) =2439107a(18) =5274072a(19) =11404090a(20) =24659080a(21) =53320283a(22) =115294335a(23) =249300825a(24) =539062799a(25) =1165614674a(26) =2520407019a(27) =5449872468a(28) =11784251403

External references