Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

A297884

Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =13a(2) =20a(3) =26a(4) =41a(5) =67a(6) =99a(7) =156a(8) =255a(9) =406a(10) =654a(11) =1075a(12) =1765a(13) =2903a(14) =4816a(15) =8015a(16) =13356a(17) =22334a(18) =37441a(19) =62847a(20) =105663a(21) =177912a(22) =299855a(23) =505826a(24) =853990a(25) =1442723a(26) =2438617a(27) =4123939a(28) =6976756a(29) =11806935

External references