Number of nX5 0..1 arrays with every element unequal to 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

A303633

Number of nX5 0..1 arrays with every element unequal to 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =3a(2) =0a(3) =8a(4) =20a(5) =66a(6) =207a(7) =726a(8) =2461a(9) =8538a(10) =29072a(11) =100909a(12) =345464a(13) =1192462a(14) =4104543a(15) =14145598a(16) =48741105a(17) =167919091a(18) =578641035a(19) =1993746222a(20) =6869984946a(21) =23672540436a(22) =81569450595a(23) =281073069448a(24) =968513250894

External references