Number of nX3 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally.

A228477

Number of nX3 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally.

Terms

    a(0) =2a(1) =4a(2) =14a(3) =41a(4) =127a(5) =386a(6) =1181a(7) =3605a(8) =11013a(9) =33635a(10) =102734a(11) =313780a(12) =958385a(13) =2927208a(14) =8940618a(15) =27307464a(16) =83405606a(17) =254747013a(18) =778077691a(19) =2376494562a(20) =7258563605a(21) =22169941573a(22) =67713990833a(23) =206819875427a(24) =631693101322

External references