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

A223840

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

Terms

    a(0) =5a(1) =25a(2) =89a(3) =249a(4) =596a(5) =1286a(6) =2578a(7) =4886a(8) =8851a(9) =15439a(10) =26072a(11) =42800a(12) =68523a(13) =107273a(14) =164567a(15) =247843a(16) =366992a(17) =535000a(18) =768715a(19) =1089755a(20) =1525574a(21) =2110704a(22) =2888192a(23) =3911252a(24) =5245153a(25) =6969365a(26) =9179986a(27) =11992474a(28) =15544709a(29) =20000411

External references