Number of 4 X n 0..1 arrays with rows nondecreasing and antidiagonals unimodal.

Terms

a(0) =16a(1) =81a(2) =208a(3) =419a(4) =760a(5) =1279a(6) =2032a(7) =3083a(8) =4504a(9) =6375a(10) =8784a(11) =11827a(12) =15608a(13) =20239a(14) =25840a(15) =32539a(16) =40472a(17) =49783a(18) =60624a(19) =73155a(20) =87544a(21) =103967a(22) =122608a(23) =143659a(24) =167320a(25) =193799a(26) =223312a(27) =256083a(28) =292344a(29) =332335