Number of 3Xn 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.

A281565

Number of 3Xn 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) =1a(2) =68a(3) =621a(4) =2426a(5) =6955a(6) =16656a(7) =36578a(8) =76332a(9) =153813a(10) =303761a(11) =591012a(12) =1135722a(13) =2162149a(14) =4084667a(15) =7664486a(16) =14298612a(17) =26540583a(18) =49040949a(19) =90250160a(20) =165483166a(21) =302426113a(22) =551024879a(23) =1001197818a(24) =1814514216a(25) =3280781211a(26) =5918961481

External references