Number of factorable (see A057765 for definition) subsets of a 2 X n uniform grid.

A057818

Number of factorable (see A057765 for definition) subsets of a 2 X n uniform grid.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =33a(4) =108a(5) =345a(6) =1014a(7) =2865a(8) =7464a(9) =19791a(10) =51286a(11) =133249a(12) =340780a(13) =875487a(14) =2237862a(15) =5804489a(16) =14938614a(17) =38623851a(18) =100015302a(19) =259836689a(20) =674534218

External references