Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

A304843

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =12a(2) =25a(3) =51a(4) =165a(5) =419a(6) =1009a(7) =2697a(8) =7091a(9) =18147a(10) =46901a(11) =122403a(12) =317379a(13) =820951a(14) =2131357a(15) =5532371a(16) =14340367a(17) =37190407a(18) =96488757a(19) =250257339a(20) =649031555a(21) =1683483587a(22) =4366629269a(23) =11325556739a(24) =29375297911a(25) =76192462975a(26) =197622279245

External references