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

Terms

a(0) =5a(1) =25a(2) =95a(3) =295a(4) =791a(5) =1897a(6) =4166a(7) =8518a(8) =16414a(9) =30086a(10) =52834a(11) =89402a(12) =146446a(13) =233108a(14) =361711a(15) =548591a(16) =815083a(17) =1188679a(18) =1704377a(19) =2406241a(20) =3349193a(21) =4601059a(22) =6244892a(23) =8381596a(24) =11132876a(25) =14644540a(26) =19090180a(27) =24675260a(28) =31641640a(29) =40272566