Number of 2 X n 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281057

Number of 2 X n 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =34a(4) =104a(5) =251a(6) =535a(7) =1076a(8) =2090a(9) =3956a(10) =7353a(11) =13474a(12) =24417a(13) =43846a(14) =78142a(15) =138374a(16) =243687a(17) =427098a(18) =745403a(19) =1296072a(20) =2246018a(21) =3880504a(22) =6686165a(23) =11491746a(24) =19706373a(25) =33722458a(26) =57596214a(27) =98195818a(28) =167136611a(29) =284039674

External references