Number of 4Xn 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281566

Number of 4Xn 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =6a(2) =815a(3) =3374a(4) =12133a(5) =31300a(6) =67834a(7) =136056a(8) =264286a(9) =498750a(10) =924374a(11) =1694678a(12) =3076872a(13) =5538752a(14) =9905630a(15) =17619912a(16) =31184144a(17) =54940940a(18) =96415390a(19) =168598070a(20) =293855280a(21) =510636866a(22) =884919690a(23) =1529682370a(24) =2638054884a(25) =4539684028

External references