Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A318080

Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =13a(1) =18a(2) =32a(3) =64a(4) =126a(5) =314a(6) =699a(7) =1778a(8) =4262a(9) =10254a(10) =25322a(11) =63395a(12) =158636a(13) =392649a(14) =973186a(15) =2419617a(16) =6047372a(17) =15095553a(18) =37607858a(19) =93596239a(20) =233272071a(21) =581969505a(22) =1451785788a(23) =3618976256a(24) =9020094130a(25) =22487625577a(26) =56080370254a(27) =139848730677

External references