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

Terms

a(0) =16a(1) =81a(2) =177a(3) =321a(4) =558a(5) =928a(6) =1479a(7) =2267a(8) =3356a(9) =4818a(10) =6733a(11) =9189a(12) =12282a(13) =16116a(14) =20803a(15) =26463a(16) =33224a(17) =41222a(18) =50601a(19) =61513a(20) =74118a(21) =88584a(22) =105087a(23) =123811a(24) =144948a(25) =168698a(26) =195269a(27) =224877a(28) =257746a(29) =294108