Number of 6 X n 0..1 arrays with rows nondecreasing and antidiagonals unimodal.

Terms

a(0) =64a(1) =729a(2) =2692a(3) =6392a(4) =12874a(5) =24095a(6) =42832a(7) =72888a(8) =119424a(9) =189263a(10) =291226a(11) =436500a(12) =639038a(13) =915991a(14) =1288172a(15) =1780552a(16) =2422788a(17) =3249783a(18) =4302278a(19) =5627476a(20) =7279698a(21) =9321071a(22) =11822248a(23) =14863160a(24) =18533800a(25) =22935039a(26) =28179474a(27) =34392308a(28) =41712262