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

Terms

a(0) =11a(1) =121a(2) =876a(3) =4466a(4) =17594a(5) =57238a(6) =160883a(7) =403159a(8) =921181a(9) =1951247a(10) =3879910a(11) =7312800a(12) =13164932a(13) =22776596a(14) =38059285a(15) =61676477a(16) =97264447a(17) =149698645a(18) =225411536a(19) =332768158a(20) =482506014a(21) =688246274a(22) =967083623a(23) =1340262451a(24) =1833947441