Number of nX2 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

A304257

Number of nX2 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =3a(2) =4a(3) =9a(4) =18a(5) =33a(6) =72a(7) =133a(8) =278a(9) =541a(10) =1084a(11) =2169a(12) =4290a(13) =8617a(14) =17088a(15) =34189a(16) =68110a(17) =135893a(18) =271300a(19) =541057a(20) =1080538a(21) =2156129a(22) =4305416a(23) =8595925a(24) =17164582a(25) =34280653a(26) =68463372a(27) =136756489a(28) =273176690a(29) =545743769

External references