Number of 3Xn 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

A224311

Number of 3Xn 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

Terms

    a(0) =27a(1) =324a(2) =1586a(3) =5996a(4) =20214a(5) =61953a(6) =174378a(7) =454832a(8) =1108958a(9) =2547780a(10) =5554847a(11) =11564081a(12) =23107746a(13) =44519456a(14) =83011127a(15) =150287312a(16) =264917825a(17) =455762696a(18) =766835415a(19) =1264104630a(20) =2044874898a(21) =3250558135a(22) =5083853932a(23) =7831604260

External references