Number of 3 X n 0..2 arrays with rows, diagonals and antidiagonals unimodal.

A223790

Number of 3 X n 0..2 arrays with rows, diagonals and antidiagonals unimodal.

Terms

    a(0) =27a(1) =729a(2) =8635a(3) =62365a(4) =334230a(5) =1455816a(6) =5425943a(7) =17876443a(8) =53233499a(9) =145612231a(10) =370377451a(11) =884526855a(12) =1998822498a(13) =4301425736a(14) =8862298953a(15) =17560558967a(16) =33594162385a(17) =62253768525a(18) =112071502931a(19) =196491932081a(20) =336258321854

External references