Number of 3 X n 0..1 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

A223839

Number of 3 X n 0..1 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

Terms

    a(0) =4a(1) =16a(2) =48a(3) =118a(4) =255a(5) =503a(6) =926a(7) =1614a(8) =2690a(9) =4318a(10) =6712a(11) =10146a(12) =14965a(13) =21597a(14) =30566a(15) =42506a(16) =58176a(17) =78476a(18) =104464a(19) =137374a(20) =178635a(21) =229891a(22) =293022a(23) =370166a(24) =463742a(25) =576474a(26) =711416a(27) =871978a(28) =1061953a(29) =1285545

External references