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

A280955

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

Terms

    a(0) =2a(1) =9a(2) =42a(3) =205a(4) =997a(5) =4850a(6) =23593a(7) =114769a(8) =558298a(9) =2715861a(10) =13211405a(11) =64267362a(12) =312630929a(13) =1520804569a(14) =7398009354a(15) =35987886621a(16) =175064388469a(17) =851607109714

External references