Number of 2 X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

Terms

a(0) =9a(1) =31a(2) =76a(3) =155a(4) =281a(5) =469a(6) =736a(7) =1101a(8) =1585a(9) =2211a(10) =3004a(11) =3991a(12) =5201a(13) =6665a(14) =8416a(15) =10489a(16) =12921a(17) =15751a(18) =19020a(19) =22771a(20) =27049a(21) =31901a(22) =37376a(23) =43525a(24) =50401a(25) =58059a(26) =66556a(27) =75951a(28) =86305a(29) =97681