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

A281401

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

Terms

    a(0) =0a(1) =0a(2) =10a(3) =52a(4) =170a(5) =484a(6) =1296a(7) =3308a(8) =8222a(9) =19996a(10) =47894a(11) =113320a(12) =265560a(13) =617472a(14) =1426498a(15) =3277796a(16) =7497418a(17) =17082444a(18) =38791072a(19) =87831508a(20) =198365446a(21) =447006060a(22) =1005324158a(23) =2257048752a(24) =5059420328a(25) =11325490728a(26) =25320461706a(27) =56545544372

External references