Number of (n+2) X 3 0..1 arrays with every 3 X 3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.
A203916
Number of (n+2) X 3 0..1 arrays with every 3 X 3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order.
Terms
- a(0) =112a(1) =392a(2) =1400a(3) =5000a(4) =17800a(5) =63368a(6) =225704a(7) =803912a(8) =2863144a(9) =10197128a(10) =36317672a(11) =129347528a(12) =460677928a(13) =1640728328a(14) =5843540840a(15) =20812080200a(16) =74123322280a(17) =263994125192a(18) =940229020136
External references
- oeis: A203916