Number of n X 2 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero.

A278088

Number of n X 2 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero.

Terms

    a(0) =0a(1) =2a(2) =3a(3) =10a(4) =27a(5) =76a(6) =214a(7) =599a(8) =1683a(9) =4721a(10) =13250a(11) =37183a(12) =104346a(13) =292828a(14) =821761a(15) =2306111a(16) =6471639a(17) =18161366a(18) =50966255a(19) =143026636a(20) =401375754a(21) =1126381063a(22) =3160963987a(23) =8870615501a(24) =24893614638a(25) =69858968603a(26) =196045273658a(27) =550161991984

External references