Number of 4Xn 0..1 arrays with rows, diagonals and antidiagonals unimodal.

Terms

a(0) =16a(1) =256a(2) =1723a(3) =6454a(4) =18980a(5) =49561a(6) =119150a(7) =267643a(8) =567197a(9) =1142224a(10) =2198273a(11) =4062420a(12) =7238132a(13) =12477929a(14) =20877528a(15) =33995513a(16) =54002935a(17) =83867606a(18) =127578211a(19) =190413722a(20) =279263958a(21) =403007495a(22) =572953490a(23) =803354343a(24) =1111996481a(25) =1520876908