Number of n X 2 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.

A229374

Number of n X 2 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.

Terms

    a(0) =8a(1) =30a(2) =126a(3) =518a(4) =2138a(5) =8818a(6) =36374a(7) =150038a(8) =618890a(9) =2552850a(10) =10530214a(11) =43435926a(12) =179168218a(13) =739048370a(14) =3048489846a(15) =12574671318a(16) =51869078378a(17) =213954005138a(18) =882535756294

External references