Number of 3Xn 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302369

Number of 3Xn 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =2a(2) =31a(3) =20a(4) =154a(5) =284a(6) =1109a(7) =3472a(8) =12763a(9) =48721a(10) =190256a(11) =770983a(12) =3134572a(13) =12931018a(14) =53433431a(15) =221779682a(16) =921445395a(17) =3833216521a(18) =15953742306a(19) =66423173327a(20) =276603513242

External references