Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 3 neighboring 1s.

A297639

Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 3 neighboring 1s.

Terms

    a(0) =8a(1) =20a(2) =113a(3) =374a(4) =1657a(5) =6548a(6) =28645a(7) =119531a(8) =517534a(9) =2230834a(10) =9747818a(11) =42562432a(12) =186902992a(13) =822076283a(14) =3625136416a(15) =16002387208a(16) =70728606718a(17) =312843642490

External references