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

Terms

a(0) =16a(1) =256a(2) =2032a(3) =9822a(4) =35509a(5) =105995a(6) =275775a(7) =646407a(8) =1395174a(9) =2815594a(10) =5372794a(11) =9777124a(12) =17079747a(13) =28794301a(14) =47049089a(15) =74774613a(16) =115931628a(17) =175785252a(18) =261231028a(19) =381179194a(20) =547003777a(21) =773063487a(22) =1077301747a(23) =1481933555